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Overlock seams are the stretchy wide seams common in teeshirts and fleeces and other stretchy garments. They are the sort of seams sergers make, in contrast to interlock seams. They use 3 – 4 threads, one or two on the top and two on the bottom of the fabric. Unlike interlock seams in which the thread under the fabric is fed from a bobbin, the lower threads in overlock seams are fed from cones through two “loopers.”

Wikipedia has an article on overlock seams, as does WiseGeek.

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