I am not sure about premium denim, because I've all but given up hope after a few bad runs at the Gap and Banana Republic for denim. I have always had gripes with Gap denim anyway, but the past year it's been ridiculous. Their cuts are off, and very narrow in the thighs - even in bootcut and boyfriend jeans. In their largest sizes in store, which is about two sizes larger than my usual size, I can't get them past the thigh.
This summer, I took up running in a club and everything, I felt like my thighs were actually starting to slim down...until I went denim shopping! I could not figure how I had been so deluded in thinking I had actually lost weight, when I couldn't pull up my normal size in any denim.