Went through my knit fabric scraps and found enough for 5 more pairs of underwear! That's as many as in a pack from the grocery store, and these are essentially free! 
Plus some of these are scraps from making sports bras, meaning I'll finally have a matching bra & panties set! I never got to have those as a teen and now that I'm an adult I can finally fix this oversight.
I did wind up ordering more pretty elastic so that I'd have the best matches for my fabric. They're not perfectly cost-free at this point, but the mental boost I'll get from knowing I've got stylish underwear was worth the cash.
Cohost: where I tell strangers on the internet my plans for making underwear.