Personally I am most comfortable in capris for yoga. I was in love with moosejaws yoga capris and disappointed when they discontinued, but these are also amazing. I use them for advanced yoga and am very happy with the fit-- standard sizing.
These Prana Audrey Knickers are great! Perfect for workouts or just lazing about. Material is very supportive without being thick or bulky. No risk of peekaboo with these, the marterial is not sheer when stretched. Waist has moderate rise and doesn't roll over. Length falls just below knee (I'm 5'3").
"These pants rock! The fabric is excellent quality and the fit is perfect."
I own three pairs of these knickers and am contemplating buying a fourth! They're awesome for yoga, climbing, running or just kicking around. The material is great quality; not too thick but thick enough that you're not worried about being 'see-through'. I usually wear a size 2, and the size x-small fits perfectly. The inseam is about 16", so for me (5'10"), they hit just below my knee cap. If you're looking for an all-around good pair of 'yoga' pants, buy these!!!