Instructables user Rachel writes:
Panties are not actually all that difficult to make, if you have a bit of experience sewing. A serger is preferable but you can make them with just a regular zigzag sewing machine too. They’re not expensive either; there’s not much material required. You need about a quarter to a third of a yard of a knit fabric (nearly any kind will do) which will easily make 3 or 4 pairs, plus a couple yards of lingerie elastic per pair. If you make thongs, you can probably do 10.