Originally Posted by
Cari-in-Oly
Many sergers can use two or three threads so it would lessen the bulk.
Cari
Some may. I used to have one that would use 2 threads but it made a rolled hem that way. The one I have currently has to use all 4. But even if you only used 2 threads, they wrap around the edge of a fabric instead of being just one line of stitching and would make considerably more bulk than a normal seam.