A short-sleeved cotton sport shirt sporting an embroidered alligator logo on the right breast, inspired by French tennis legend René Lacoste. This shirt marked the first time that a logo was ever worn on the outside of a garment. The alligator logo is really a crocodile, which was Lacoste's nickname. When President Dwight D. Eisenhower wore one while playing golf, they became extremely popular and knit polo shirt copies soon appeared.
Historical Dictionary of the Fashion Industry. Francesca Sterlacci and Joanne Arbuckle.