Personalized Groovy Retro I Love My Little Sister Very Much T-Shirt. Show your sister some love with our Groovy Retro I Love My Little Sister Very Much design. This fun and cute design features a heart and the words "I love my sister" in a stylish retro font. It's the perfect gift to let your sister know just how much you appreciate her. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.