so I just got my black tech fleece pants in today. just some stats for some prospective buyers:
5'7.5", around 175 lbs, athletic build. Usually a 30-32 waist, (30's in 511's, 32's in 510's). Bought a size medium in the tech fleece pants.
Definitely a lot more fitted than the (M) H&M black zipper sweats, and a more "skinny fit" than the (M) H&M Basic grey joggers. Compared to H&M basic greys they fit slimmer in the thighs and definitely more snug towards the knee down. If anything the fit is very comparable to the H&M black zipper sweats size wise minus the "drop crotch/diaper" look the H&M sweats have. Just for more comparisons I find the tech fleece fit nearly almost identical to the fit of the recent Publish Brand Legacy joggers if you size down from your TTS. All in all I can say IMHO STAY TTS.