I have quite a small waist and trousers or jeans fit me when I first put them on but very quickly seem to start falling down. I can't buy a smaller size as I struggle to get my bum and hips into anything smaller. I think it's not helped by fabrics stretching out a bit as I wear them but I can't prevent that and the clothes I'm wearing aren't necessarily low quality. I don't imagine a belt would help much as it seems that there is so much fabric that I would have to gather or fold the fabric to fit to my waist. How does everybody else deal with this? I am sick of an outfit looking nice and then spending all day pulling up my trousers as they're sagging under my bum!