I suggest wearing some clothes that reach to the middle of the buttocks. Because the buttocks and pelvis are big, if the clothes that are too long cover the buttocks, the walking will actually be even bigger. So don't wear clothes that cover the whole buttocks, or it will be counterproductive. Don't wear clothes that show the whole buttocks, because this will create a sense of disconnection between the upper and lower parts.

But if you feel that your hips are big when you wear long clothes or skirts, etc.