Personalized Law Enforcement Sister Police Officer T-Shirt. Proud of my sister law enforcement support blue line flag T-Shirt - Black for brother or sister of a police officer, sheriff or other police employee. Everyone loves our Custom T-Shirts! 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.