From ankle to upper thigh the fit is great, after that kinda like a big pair of dungarees. The double belt loops in the front add a lot of bulk.
There are these two lined pockets cut into the butt above the sewn pocket. My ass maybe is flat, but these pockets act like a slash in the pants and make the butt kind of sag. The liner of the pocket makes the butt feel bulky too.
Dogfunk should add the extra pockets to the description - I'll start doing squats.