I've just bought two pairs of Gap Revolution Skinnies (having seen them recommended on here) and they're driving me mad after a few hours wear. They're slipping down so not only am I having to hoick them up at the waist but also at the groin, like a pair of tights. They seemed a good, snug fit when I tried them, now I've got a saggy bum! Is it me, the jeans or have I bought them too big on the waist (they're comfortable rather than hold-your-breath tight). Kinda disappointed to say the least!