I could never figure out why men with bellies wore their pants below the belly, at the hips instead of at the waist. Now I think I understand--it has to do with the way men's pants are proportioned and the way a man's fat is distributed, especially in the butt. (I had female fat distribution but always wore my slacks and jeans at the hip, myself.)
It used to faintly disturb me--and it still does--to see a man with an ample belly who wore his pants at the waist. Now I see why it bothers me--he seems to be dressing like a woman. I know a pre-everything trans man, with extra baggage around the middle, who does that. He wonders why he doesn't pass. We tell him he needs to go on T if he wants to be read as male (that's pretty obvious), but I think he'll still have problems if he continues to dress the way he's dressing now. With his large hips, he might keep wearing his pants that way. I think he's going to be in the androgynous zone for a long, long time.