Bought these in True Black Ghost Plaid for my son - Sz Medium. He is a 33/32 in jeans (5'9" tall and 180 lbs.) and the fit is pretty good with the adjustable waistband, but if you have an athletic build (muscular thighs/butt) they are a bit snug. Didn't have the luxury of time to order a Large to compare so he'll have to make it work. He really likes them so I hope he doesn't split a seam on the mountain!