Personalized Cowboy Groom's Posse Youth T-Shirt. Cowboy groom's posse! A country western themed wedding has groomsmen who are cowboys, and together they make a posse for the newlywed groom! For when a cowboy and cowgirl get hitched. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.