FLATLOCK BASICS
A serger flatlock stitch is a seam that is pulled open after serging, and unlike a regular overlock stitch, there is no bulky seam allowance. Instead, the fabric layers are abutted together when the seam is opened, which creates a flat, chafe-free seam that’s also very decorative.
On the upper side, the stitch looks similar to a regular overlock stitch, and on the reverse side, there is a row of horizontal lines, also called ladders. Both sides of this stitch can be used on the outside of your makes.
A serger can sew both a 2- and 3-thread flatlock version. The 2-thread uses only the lower looper, plus needle thread, and is easy to open up flat, making it an excellent choice for decorative purposes. The 3-thread flatlock…