This Ossi 38mm belt is just perfect for jeans and is available for a huge range of waist sizes (28", 30", 32", 34", 36", 38", 40", 42", 44", 46", 48", 50", 52", 54", 56", 58", 60"). It has a smooth roller buckle so the belt doesn't rub and has a classic block edged finish.
eBay