(UPDATED REVIEW) Using their size chart, I ordered a 42 for a 40 inch waist. It fits right in the middle with 3 extra holes on each side. They went above and beyond with the packaging and also added a hole punch (if needed) for future modifications. The bad news: After a few weeks, the black coating started peeling off the skin. Although listed and looking like hard leather, the black is a "rubber" finish and not a stain. Very disappointed with it. At least the buckle is cool and can be replaced with another belt.