Well I didn't size up (but I usually go XS for Uniqlo anyways) but at a 31" waist, 19" thigh, 14" calf they don't see tight at all. That might change with drying them, but I wasn't going to dry them in case of zipper bulges.
uu sweats are incredible, thinking of ordering another pair. I bought the uu cargo pants...now I'm not sure what to do with them. Maybe I'll taper them a bit more.
the tasmania wool trousers that I always see toasty wear are nice as well considering their $40 sale price.