Personalized Sweetest Big Sister Long Sleeve T-Shirt. Who's the sweetest big sister? Cute Long Sleeve T-Shirt - Charcoal with adorable smiling cupcake with pink frosting and red cherry on top says SWEETEST BIG SISTER. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL