If it wasn't for the difference in size, you might not be able to tell them apart. For your inseparable buddies, an incomparable matching set of just-hanging-out gear. T-Shirts and sweatshirts are both a 90/10 cotton/poly blend, machine wash; embroidered hats are 100% brushed cotton twill with adjustable back. Imported. Big Guy Shirts, L, XL, XXL. Little Guy Shirts, 2T, 3T, 4T. Little Guy Hat, fits youth ages 4 and up. One-piece bodysuit in 6 months, 12 months, 18 months and 24 months. Sold Separately.