Polo Ralph Lauren Lite Weight Hoodie, 3XB, White Excellent Used Condition 100% Cotton Casual Wear at its best! FYI...3XB is a men's clothing size that indicates a chest measurement of 54–56 in and a waist measurement of 50–52 in. The "B" in 3XB stands for "Big", which means the clothing is designed to be more relaxed and provide extra space in areas like the chest, waist, and torso.