My club jersey only comes in men's sizes, and the bottom rides up while I ride. It isn't stretched out of shape while I'm still, and pull the bottom down, but it creeps when I ride. My solution was to cut the elastic out and rehem. So.... if the jersey isn't too snug about the hips, you might try removing the elastic, or buy a size up. Kind of depends on how you accept the rest of the fit. All this makes me a devotee of women's cut jerseys.