I actually really like these a lot, I have a relatively average-ish small waist size and a very generic shoe size lol. if i found these in a shop i would absolutely buy them :D

also people are thinking to much, they aren't 'lace ups' thats the illusion, it looks like elastic string to me while the waist is drawstring like pajamas. so as long as you're not particularly fat or skinny, you just buy your shoe size and 1 size fit all.

btw the confessions of a teenage drama queen is where i saw them first as well, and they look much better as a converse twist, black fabric white 'lace' strings :)