Don't bother. I have 510s, they're REALLY skinny... Size 30 in 510s is skinnier than Cheap Monday tights in 28. They run about a size small in the waist I think, I picked up a pair of 28s to try on (my normal size) and they were literally cutting off my circulation. 29's still gave me mooseknuckle. 30 worked nicely, as I could actually sag the 30's decently. Waist size 32? You'll need at least a 34, if your legs are really skinny, and you're making it sound like they're not. Just size down one in 511's if you want a slimmer fit, 510 is for the emaciated only. Try cheap monday tight fit, true to size, if you want something slimmer than 511, and not as ball crushing as 510.