I wear size 40 but these don't fit.

Guess my gut is bigger than a size 40 Levi or Wrangler jeans because I have to wear these with the buttons open on the sides even though I wear size 40 Levi's and Wranglers. I also don't like that fact that the straps connect to a piece that is sown on the front at a place lower that the edge of the material. So the material tends to roll inward and is uncomfortable. Bummer.