I have a 25.5 inch waist, 5'1" and got an XS. They do have some stretch, but anything tighter would cause muffin top. They are snug (but not difficult) to slide over my hips and then sit comfortably on the smallest part of my waist. I think a small would have been too big so I think the size I got is perfect. The legs fit well, so no complaints there, and the fabric also has a little stretch. It feels polyester-ish but not scratchy. The waist is elastic (but doesn't bunch) with no closure or button and there are front pockets. Overall no weird bunching or gaps on me or anything, but I'm not super curvy on my lower half either. My only complaint is that they're too long, but I'm short and used to hemming my clothes.
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