I found the loose tights to run small on the hips. I am an L in everything, but when i got a pair of L loose tights last year they were too snug on the butt. (everything else was fine)
Maybe it's just my butt is too big...
Anyway, I sent them back. Very sadly. You might want to call and ask them about fit for this year's model. (this year's has zipped pocket)