The term 'Big Name in Casualwear' can be summarized by the crossword solution Lacoste (7 letters). Lacoste is a French clothing company founded in 1933 by tennis player Rene Lacoste. The company is best known for its iconic polo shirts, which feature the brand's signature crocodile logo. Lacoste has become a major player in the casualwear market, offering a wide range of apparel and accessories for men, women, and children.