Pants that cling are not my body's friend, though. And I do skate 4-5 per week, so does that mean I should be fit enough to wear tight clothing? Alas, no. Some women, post-kids for example, would rather not have to wear things that cling at the belly. Or have medical issues that mean they don't have flat bellies, and would rather not show that off. I haven't quite found the ideal solution yet. I'm short, so that doesn't help. I don't want the pants to be super clingy around the belly, so leggings don't work. I would like them to not be too wide at the bottom so they don't catch in my blades, but... So I continue to look.
They make yoga leggings with a skirt attached, or you can buy a really short chiffon wrap skirt from a dance store that will cover the waist and butt that you can wear over leggings. Also a lot of yoga places make long tank tops that you could layer that cover the butt.
Another option for non-leggings people are those Adidas stretchy tapered soccer pants - Adidas Tiro 17. A lot of the guys wear them, and some girls too. They're looser around the butt and tapered and tight around the ankles, with zippers that you can zip down over your skates.