I don't shop much but in mens plain tees I like Targets Mossimo red brand. They only go down to small (I'm 5'2 115lbs) but they're 'athletic fit', so they're more snug, so as long as you're not trying to use them as camouflage they're good. Jeans shopping you're on your own. I don't think my size is even made in mens, I just get lucky every couple of years and find something that works. My current pair are boys cherokee, clearanced out before the jeans re-set, and I got them for just under $6.