tights stretching out

  1. Every single pair of tights I have, including several pairs of expensive Wolford tights, tend to stretch out at the seam near the crotch. I think it's because I have a big butt, but does anyone else have this problem? It's not really a big deal because you can't see it, but when I examine the seam area near the butt, the fabric is stretched out a bit. It worries me...