Explore our shirts collection from the best brands in the market, i.e., Levi's, Gap, Lacoste, Marvel, Diesel, Calvin Klein, and others. U.S. Polo Assn. is an American clothing and fashion apparel brand that manufactures t-shirts, shirts, dresses, beachwear, handbags, and much more for women, kids, and men. Gray is the standard choice and makes many products beautiful without much effort.