You might find that your hems will rip out if you don't do -something- to allow them to stretch. If your machine can't sew a zig-zag without trouble, have you tried a step zigzag? It's got 3 stitches in one direction, 3 back etc, and it does stretch more than a straight stitch. You should also take some scraps and try a double needle. Modern machines have a slight path deviation so you can keep the 2 threads separate, but I've had some success threading both threads exactly together on older machines. If your machine has 2 places to put a spool, most likely it has some way to use a double needle too (and the flat part of the needle must face back, so the needles are perpendicular to you, you can see both clearly from the front). Once you're threaded, you're ready to go. This isn't foolproof (maybe I'm a brutal dresser :-)), but it works best in knits, short of a serger.
And give yourself an extra pat in the back for doing this out of what's really very difficult fabric. If you used a thick cotton knit (lycra blend?), you'd find it much easier to sew...
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