There is no stretch in this denim. The idea is the jeans will be super tight when you put them on, but over the course of the first week (of wearing them everyday!) they will relax to the shape of your body. If you find they remain snug and just need a bit more stretching, get them damp and wear until they're dry. If they're wearing a tad too loose, tighten up the tie in the back. Also, the more you wear your Merica Lee's the better they'll look!
Wash infrequently. Spot wash if necessary. Pop them in the freezer over night to get rid of any odor.