Where do you buy your jeans?

And how do you know what jeans style is your fit?

I have 2 pairs of jeans. One 10-year old pair of skinny jeans from Lucky Brand and a 4-year old pair of the original 90s cheeky jeans from everlane. I do realize that the everlane ankle cut jeans shorten me (as probably most modern styles will) and Id like to lengthen my lool as much as possible. Im 5'8 and 140ish pounds, longish torso.