Male Basics Sexy Pouch Thong Confetti Large Briefs from Male Basics Underwear. Take a measurement tape and your posture should be nice and straight, without holding in or sticking out your stomach, Locate the bones on the right and left side of the abdomen. For Malebasics Underwear measure approximately 5 inches under the belly button. Now locate the range between any of the values on the table and that would be your size. Large fits men 36 inches to 38 inches. SKU MBH05CONL. Color filter Printed. Material fabric content: 78% Polyester, 22% Spandex. Brand Male Basics Underwear.