Personalized 3rd Grade Teacher Halloween Costume Long Sleeve T-Shirt. 3rd Grade teacher I'm batty about my students Long Sleeve T-Shirt - Charcoal makes a great Halloween week costume idea. 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