This t-shirt is perfect for your next birthday! Let everyone know you're authentic, original vintage in this personalized birthday year t-shirt. Since 1976, 40th birthday. The design is a vintage old school athletic style and makes a great birthday gift idea. Celebrate in style with a tee that's made just for your year! Our cotton tees are machine wash and dry. Small: 20.5 inches across chest, Medium: 22 inches across chest, Large: 23.5 inches across chest, XL: 25.5 inches across chest, 2XL: 27.5 inches across chest.