Lisa,
You might want to give Pearl Izumi Breakaway shorts a try. I just returned some I got half-price at Nashbar because the leg elastic was really loose on me! I do NOT, I repeat, do NOT, have skinny thighs for my size either - I'm short and slender, and my thighs are definitely medium-sized for my frame, not skinny. I would highly recommend these shorts for anyone who haves ample thighs for their hip size as the fabric was nice, chamois seemed very good, my only complaint was the leg grippers being too loose. The sizing runs true to size, as far as I could tell.
Emily



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I'm secretly convinced they make the leg elastics using the same circumference as men's without even thinking about it. 
. I have two pairs of these shorts and the grippers are not loose on me at all, but they are not too tight either -- they're comfortably snug (I don't really notice them much but my shorts stay down). I'm 5'6", 125, with ahem, ample thighs
