Personalized Bride's Posse T-Shirt. Cowgirl bride's posse! A country western themed wedding has bridesmaids who are cowgirls, and together they make a posse for the newlywed bride! For when a cowboy and cowgirl get hitched. 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.