The Importance Of Notches When Aligning On-Seam Pocket Pieces
Perhaps one of the most important instances when notches become a crucial element in dressmaking is when sewing on-seam pockets. Not only do notches provide important markers to align each pocket bag, they also provide a mark for the pocket bag opening.
In an on-seam pocket application, the garment's seam edge and its corresponding pocket layer should have two notches. The top notches marks the top pocket opening while the bottom corresponds to the pocket's bottom opening corner. These two notches also mark the correct pocket opening position along the seam.
The pocket notches along both seam edges housing the pocket should be positioned at the exact distance form the top and bottom. The notches along both edges will guide you in aligning and stitching each pocket piece such that when the seam is brought together, the pocket edges align perfectly to form the pocket bag.
In the seam alignment process, all edges, including the pocket layers and top and bottom portions of the seam should align perfectly when placed on top of each other with face sides touching. This intuitive alignment is only possible due to the notch placement along each edge and how accurately the corresponding notches were matched in the sewing process.