Men are typically larger than women, so most of their sizes run big. Add 21 to the size of your normal pants to determine your waist size in the men’s department. For example, if you wear a size 6 in women’s pants, you will wear men’s pants with around a 27-inch waist. You may need to go up a size, because men’s pants are not as wide in the hips as women’s. Subtract one and a half from your shoe size to determine what size men’s shoes you wear. For example, if you wear a size 10 woman’s shoe, you wear a size 8 1/2 man’s shoe.