Mini Tutorial: How To Sew A Tuck Seam
A tuck seams resemble a regular welt seam (fancy term for topstitching on one side of the seam) but if you take a closer look at it's structure, you will notice that the topstitching is the only stitch that keeps the seam together. As a result, a placket-like fold is formed along the seamline.
1. Start by folding and ironing one of the seam edges at the designated seam allowance. In this case, the seam allowance is 1/2" thus the fabric edge is folded and pressed at a 1/2" distance throughout.
2. Mark the seamline on the the other fabric edge using a quilting pencil or tailor's chalk and align the folded edge with this line as shown. As a reminder, the seamline is positioned at the seam allowance distance from the fabric's cut edge. Insert a few pins horizontally through all fabric layers to maintain this alignment.
3. For increased precision and comfort during the stitching process, hand baste the folded edge to the fabric layer underneath making sure the seamline remains perfectly aligned to the folded edge.
4. Topstitch along the folded edge, using the hand basting as s guide and catching all seam allowance layers underneath. Topstitching next to the hand basting and not directly on top of it will ensure easy removal when no longer needed.
5. Last but not least, remove the hand basting using a seam ripper and iron the finished seam to release any stitch tension and smooth out the tuck seam fold.