I got a pair of these (in black) the other day and they are just great. They're thick enough to wear as pants with a long top, are super-comfy, make your legs look great, and best of all, don't give me muffin top, as some tights/leggings can. Thought I'd pass it on!

http://www.hue.com/Leggings/Cargo-Legging.aspx