I've found that sizing for jeans doesn't really seem to match anything else in the real world... possibly because denim stretches? At my biggest, I was wearing 34-inch Levis while my dress pants were 36- or 38-inches. If you measure your waist (or stomach; whichever is larger) with a tape measure the sizing on Love2Pedal is pretty accurate. As you get toward the top of the size range, the bibs start to get pretty snug. If you don't like snug, the next size up might be more comfortable. The good news is that the bibs have a 30-day guarantee and Dan at Love2Pedal is great about exchanges.