Really bad fit - Westcomb Recon Cargo Pants - Mens

I have a BD BDV hoody made from the same Shoeller dynamic material with nanosphere, and I really love the material. I've been looking for a pair of pants made from the same material for a while (BD discontinued their BDV pants), and I was super excited to find these Westcomb pants using the same material. However, as soon as I received my order and tried them on, my excitement turned to disappointment. The fit is horrible. I normally don't complain about fit, but these are really bad. I'm 5'8 140 lbs, 30 waist, athletic build, and the size S should fit me pretty well (and it does in the waist area). However, there is an excess amount of material in the butt and crotch area. It's not just cosmetic, I can really feel all that excess material when I tried walking around, lifting my leg, etc. Like I have a plastic bag hanging off my backside, it feels very annoying. I can literately pull these pants all the way above my belly button, that's how much excess material there is. I have stretchy, hiking/climbing pants from MHW, dead bird, BD, and none of them fit like this. Consider how expensive these pants are, and the legendary product quality I've heard about Westcomb, I am really disappointed. I'm considering returning them, but it's so hard to find pants made from the same material.