On some it's the top corner of the waistband that curls outwards, on others it's the bottom corner of the waistband and the top edge of the zip cover (I'm sure that's not the right name for it but my mind's gone blank!) that sticks outwards. Either way, it's very abrasive and wears holes very quickly. Perhaps it's my peculiar shape that exacerbates it, but there was a thread on the old forum about it so I know I'm not alone! I've just reached the point where I have to solve the problem because two tops I made fairly recently are already showing signs of wear!