Doina Alexei
  • Sewing Tutorials
    • Basics >
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      • Rotary Cutters or Fabric Scissors?
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      • What Are Notches And How To Use Them In The Sewing Process
      • Transferring Notches From Pattern To Fabric
      • Transferring Seamlines to Fabric
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      • Backstitching: A Complete Guide
      • Hand Basting: A Complete Guide
      • Sewing Continuous Bias Binding
    • Darts >
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      • Handling Dart Excess: Bulk And Tension
      • How To Sew A French Dart
      • How To Sew And Iron Single Pointed Darts
      • How To Sew And Iron Contour Darts
      • Sewing Darts With Decorative/Beaded Fabrics
    • Sewing Seams >
      • ​The Basics Of Seams And Seam Allowance
      • How To Sew A Straight Seam
      • Sewing Curved Seams
      • Sewing Corner Seams
      • Trimming And Grading Seam Excess
      • Notching/Clipping Seam Allowance for Tension Release
      • Sewing Topstitched Seams
      • Sewing Corded Seams
      • Sewing A Slot Seam
      • Sewing A Gathered Seam
      • Sewing Bias Seams
      • Sewing Seams With Ease
      • Sewing Seams With Crossing Seamlines
      • Sewing Unlike Fabric Seams
      • How To Iron Seams: Ironing Tools And Conventions
      • Sewing With Knit Fabrics
      • Understanding Stitch Length And Tension
      • Sewing Unique Fabric Seams
    • Seam Finishes >
      • Seam Finishing Techniques - Overview
      • Applying A Pinked Seam Finish
      • Applying A Bias Bound Seam Finish
      • Serging And Zigzag Seam Finishes
      • Sewing A Self-Bound Seam Finish
      • Sewing A French Seam Finish
      • Sewing A Hong Kong Seam Finish
      • Sewing A Mock French Seam Finish
      • Sewing A Turned-and-Stitched Seam Finish
      • Sewing Overcast Hand-Applied Seam Finishes
      • Sewing A Flat Felled Seam
      • Sewing A Hairline Seam Finish
    • Hem Finishes >
      • Garment Hem Finishes: Overview
      • ​Sewing A Double Fold Hem Finish
      • Sewing A Single Fold Hem Finish
      • Sewing Bound Hem Finishes
      • Sewing An Exposed Double Layer Bound Hem
      • Sewing A Folded-Up Bound Hem with Pre-folded Binding
      • Sewing A Hong Kong Hem Finish
      • Sewing A Band Hem Finish
      • Sewing A Bias Faced Hem Finish
      • Sewing A Twill Tape Hem Finish
      • Sewing A Rolled Hem Finish
      • Sewing A Shaped Hem Facing
      • Using Fusible Hem Tape And Webbing
      • Finishing A Lace Fabric Hem
      • Finishing A Leather Hem
      • Sewing Faced Hem Corners
      • How To Finish Lining At The Hem
      • Finishing Fabric Corners by Mitering >
        • Mitering Fabric Corners With A Full Bias Facing
        • Mitering Fabric Corners With Exposed Binding
      • Interfacing A Hemline: Lined And Unlined Examples
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        • Sewing A Faced Slit Pocket
        • Sewing A Rectangular Slash Pocket
        • Sew A Star-Shaped Faced Pocket
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      • Finishing Armhole Edges With Decorative Trim
    • Neckline Finishes >
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        • Sewing An Extended Front-Neck Facing
        • Sewing A Separate Neck-Front Facing
      • Sewing A Bias Faced Neckline Finish
      • Sewing A Band Neckline Finish
      • Bound Neckline Finishes: Overview >
        • Sewing A Single Layer Bound Neckline
        • Finishing A Neckline With Pre-Folded Binding
        • Sewing A Double Layer Bound Neckline Finish
      • Sewing A Semi-Stretch Strip Band Neckline
      • Ribbed Neck Band And Classic Turtleneck
      • Decorative Neckline Finishes >
        • Sewing A Neckline With Decorative Inset
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    • Finishing Facing Edges >
      • Finishing Facing Edges: Overview
      • Folded-And-Topstitched Overedge Facing Finish
      • Sewing A Bound Facing Edge Finish
      • Sewing A Hong Kong Facing Finish
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      • Sewing A Twill Tape Facing Edge Finish
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    • Extras >
      • A Complete Guide on Interfacing
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How To Sew A Flat Felled Seam In Dressmaking

What Is A Flat Felled Seam
A flat felled seam is a technique used in dressmaking to achieve a high quality, durable seam finish which is often used with activewear, denim, sport coats, and children’s wear. 
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The most common flat felled seam applications are found on jeans, mainly along their center back/front and side seams.
A flat felled seam is considered a self-enclosed seam finish. It contains all seam allowance edges within a folded topstitch located on one side of the seamline and visible on the face of the garment. For that reason, a flat felled application can also be considered a decorative finish providing a more sporty, casual effect. 
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As is true for any topstitched seam, the visible stitch should be applied carefully at an even distance from the seamline. You can use contrast thread for a more unique finish, or keep the thread color matching that of the garment for a more subtle look: the choice is up to you!
Similar to constructing a French seam, a flat felled application is another instance where the fabric wrong sides are touching when the seam is aligned and stitched. 
Picture
As opposed to a French seam however, a flat felled finish encloses the seam allowance layers on the face side of the garment under a topstitched folded edge. It is this structure that provides sturdiness, rendering the flat felled technique perfect for use with heavy duty garments. ​
​As you’ll see in the sewing steps below, a flat felled seam forms a tunnel right next to the seamline. For that reason, a flat felled structure can also be used as an option for corset boning applications in eveningwear, bridal and lingerie. 

Sewing A Flat Fell Seam

Assuming the seam allowance is ½”: 
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1. Align the seam edges with fabric wrong sides touching. Insert pins horizontally or hand baste the two fabric layers together to keep them in place for machine stitching. 
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2. Stitch the seam at ½” seam allowance, or whichever your designated seam allowance is.
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3. Remove the hand basting (if any) and press the seam allowance open as shown above.
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4. Trim one of the seam allowance edges down to 1/8" or 1/4”: this trimming process is called grading. The shorter seam allowance edge will now correspond to the topstitched side. Keep in mind that a good pair of fabric scissors is imperative in the grading process. 
​It is also important to note that since flat felled seams receive a topstitch on just one side, any matching seams on the garment should be graded and pressed in the same direction. For example, a garment's side seams should be trimmed and folded exactly in the same direction so that the topstitching ends up on the same side of the garment (front or back). 
Picture
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5. Next, iron the untrimmed (wider) seam allowance edge towards the side of the trimmed edge such that it overlaps it as shown.  Bring the folded edge over the trimmed seam allowance layer such that all fabric raw edges are enclosed. 
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6. Insert pins horizontally to keep the folded edge in position. Again, you may choose to hand baste for extra stability. 
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7. Topstitch through the folded edge and all layers of the seam allowance and garment underneath, following the folded edge as a guide. Stitch as close to the fold line as you can, maintaining a smooth and even topstitch throughout. 
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Picture
8. As a final step, remove the hand basting (if any) and press the finished flat felled seam in the direction it was topstitched. Use a protective cloth for heat sensitive fabrics, especially if you iron from the garment's face side. 
Picture
The final flat felled application should have an evenly distributed topstitch, and fully enclose all fabric raw edges within the finished seam both on the inside and outside of the garment. 
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  • Sewing Tutorials
    • Basics >
      • Aligning Pattern Grainlines To Fabric
      • Preparing Fabrics For Sewing
      • Pinning Sewing Patterns To Fabric
      • Placing Sewing Patterns On Fabric For Cutting
      • Rotary Cutters or Fabric Scissors?
      • Cutting The Sewing Patterns
      • What Are Notches And How To Use Them In The Sewing Process
      • Transferring Notches From Pattern To Fabric
      • Transferring Seamlines to Fabric
      • Staystitching
      • Backstitching: A Complete Guide
      • Hand Basting: A Complete Guide
      • Sewing Continuous Bias Binding
    • Darts >
      • Marking And Transferring Darts To Fabric
      • What Are Darts And Dart Components
      • Folding, Pinning And Hand Basting Darts
      • Handling Dart Excess: Bulk And Tension
      • How To Sew A French Dart
      • How To Sew And Iron Single Pointed Darts
      • How To Sew And Iron Contour Darts
      • Sewing Darts With Decorative/Beaded Fabrics
    • Sewing Seams >
      • ​The Basics Of Seams And Seam Allowance
      • How To Sew A Straight Seam
      • Sewing Curved Seams
      • Sewing Corner Seams
      • Trimming And Grading Seam Excess
      • Notching/Clipping Seam Allowance for Tension Release
      • Sewing Topstitched Seams
      • Sewing Corded Seams
      • Sewing A Slot Seam
      • Sewing A Gathered Seam
      • Sewing Bias Seams
      • Sewing Seams With Ease
      • Sewing Seams With Crossing Seamlines
      • Sewing Unlike Fabric Seams
      • How To Iron Seams: Ironing Tools And Conventions
      • Sewing With Knit Fabrics
      • Understanding Stitch Length And Tension
      • Sewing Unique Fabric Seams
    • Seam Finishes >
      • Seam Finishing Techniques - Overview
      • Applying A Pinked Seam Finish
      • Applying A Bias Bound Seam Finish
      • Serging And Zigzag Seam Finishes
      • Sewing A Self-Bound Seam Finish
      • Sewing A French Seam Finish
      • Sewing A Hong Kong Seam Finish
      • Sewing A Mock French Seam Finish
      • Sewing A Turned-and-Stitched Seam Finish
      • Sewing Overcast Hand-Applied Seam Finishes
      • Sewing A Flat Felled Seam
      • Sewing A Hairline Seam Finish
    • Hem Finishes >
      • Garment Hem Finishes: Overview
      • ​Sewing A Double Fold Hem Finish
      • Sewing A Single Fold Hem Finish
      • Sewing Bound Hem Finishes
      • Sewing An Exposed Double Layer Bound Hem
      • Sewing A Folded-Up Bound Hem with Pre-folded Binding
      • Sewing A Hong Kong Hem Finish
      • Sewing A Band Hem Finish
      • Sewing A Bias Faced Hem Finish
      • Sewing A Twill Tape Hem Finish
      • Sewing A Rolled Hem Finish
      • Sewing A Shaped Hem Facing
      • Using Fusible Hem Tape And Webbing
      • Finishing A Lace Fabric Hem
      • Finishing A Leather Hem
      • Sewing Faced Hem Corners
      • How To Finish Lining At The Hem
      • Finishing Fabric Corners by Mitering >
        • Mitering Fabric Corners With A Full Bias Facing
        • Mitering Fabric Corners With Exposed Binding
      • Interfacing A Hemline: Lined And Unlined Examples
    • Sewing Pockets >
      • Curved Patch Pocket With Flap
      • Unlined Square Patch Pockets
      • Lined Patch Pockets: Two Ways
      • Extension On-Seam Pockets
      • Separate On-Seam Pocket
      • Front Hip Pockets
      • Bound Double Welt Pocket
      • Double Welt Pocket With Flap
      • Self-Welt Pocket (Using Single Fabric Layer)
      • Slanted Welt Pocket (Hand-Stitched)
      • Faced Slash Pockets: Overview >
        • Sewing A Faced Slit Pocket
        • Sewing A Rectangular Slash Pocket
        • Sew A Star-Shaped Faced Pocket
    • Sewing Zippers >
      • Sewing Zippers: General Information
      • Sewing A Centered Zipper
      • Sewing A Lapped Zipper
      • Sewing An Invisible Zipper
      • Sewing A Fly Front Zipper
      • Sewing A Closed-End Exposed Zipper (No Seam)
      • Sewing An Exposed Separating Zipper
      • Sewing Hand Stitched Zipper Applications
      • Sewing A Zipper Underlay
      • Sewing A Placket-Enclosed Separating Zipper
    • Sleeveless Finishes >
      • Sleeveless Armhole Finishes: General Information
      • Finishing Sleeveless Garments with Lining
      • Sewing A Folded-Under Bound Armhole Finish
      • Sewing A Shaped Armhole Facing
      • Finishing Armhole Edges With Exposed Binding
      • Finishing Armhole Edges With Decorative Trim
    • Neckline Finishes >
      • Sewing A Neck Shaped Facing
      • Sewing An All-In-One Neck Facing
      • Neck And Garment Opening Combination Facings >
        • Sewing An Extended Front-Neck Facing
        • Sewing A Separate Neck-Front Facing
      • Sewing A Bias Faced Neckline Finish
      • Sewing A Band Neckline Finish
      • Bound Neckline Finishes: Overview >
        • Sewing A Single Layer Bound Neckline
        • Finishing A Neckline With Pre-Folded Binding
        • Sewing A Double Layer Bound Neckline Finish
      • Sewing A Semi-Stretch Strip Band Neckline
      • Ribbed Neck Band And Classic Turtleneck
      • Decorative Neckline Finishes >
        • Sewing A Neckline With Decorative Inset
        • Sewing A Piped Cording Faced Neckline
        • Sewing Decorative Trim To A Finished Neckline
    • Finishing Facing Edges >
      • Finishing Facing Edges: Overview
      • Folded-And-Topstitched Overedge Facing Finish
      • Sewing A Bound Facing Edge Finish
      • Sewing A Hong Kong Facing Finish
      • Sewing A Rolled Edge Facing Finish
      • Sewing A Twill Tape Facing Edge Finish
      • Sewing An Overedge-Stitch Facing Finish
    • Extras >
      • A Complete Guide on Interfacing
      • Sewing Bound Spaghetti Straps
      • Sewing Spaghetti Straps To A Faced Neckline
      • Sewing Ruffles: Overview
      • Patterning And Sewing A Circle Ruffle
      • Sewing A Gathered Heading Ruffle
      • Sewing Double Layer Gathered Ruffles
      • Sewing A Gathered Ruffle Into A Seam
      • Sewing A Gathered Ruffle To A Fabric Edge
      • Sewing A Fabric Surface Slit
      • Sewing A Slit Seam
      • Hand-Applied Straight Stitches
      • Hand-Applied Blind Stitches
      • Hand-Applied Overedge Stitches
      • Hand-Applied Tack Stitches
      • Hand-Applied Decorative Stitches
  • Custom Apparel
    • Custom Bridal
  • Submit A Sewing Question
  • About
  • Blog