I tried on a pair. I would go for the smaller size, if I were you. I wear jeans that are a size or two too big all the time, but it was impossible for these, as the bigger sizes were ridiculously huge, and they gaped and slid right down. When I tried the 25 (often my usual size, in other brands), many inches of my low-rise underwear were showing (front and back), if you get the idea, and sadly, the store had run out of 24s.
This is the pair I tried:
http://azaleasf.com/swywv1000058.html