A gathered seam looks quite unique in pattern form- it is one of the few instances in dressmaking when seams do not match in length when looked at in flat form.
To start with, the corresponding seam edges will have a big difference in length. The edge to be gathered should be fairly easy to spot, as this will not only be the longest of the two, it will also be marked within the seam allowance using either dash lines, a dotted line, writing or personalized mark a specified by the manufacturer.
Marking notches play an important role in the co ate toon of a gathered seam. While at first glance, the corresponding notches along each edge don’t seem to match, once the linger edge is gathered, the notches should perfectly align. As always, notches facilitate the seam alignment process but in the case of a gathering seam, notches play an important role in distributing the gathers correctly and evenly across the seam. Naturally, since the notches are on the longer edge are designed to align with the notches along the plain edge, there should be an equal amount of corresponding notches along each edge.