With a 32inch waist kilt the tightest fit should be 31inches, which is still 5 inches too big. You can however make an extra hole right at the start of the strap to make the waist even smaller. However, measure yourself right up just under your ribs and you may find that your a little bigger there and that's where the kilt will sit. Your hips should stop the kilt from slipping down, so just strap your belt on tight and hopefully all should be well. I know it's a lot of money to pay out if the fit isn't just right, but I'm sure in the worst case you could have the strap moved to ensure a perfect fit.