Credit: Courtesy of Calvin Klein

CK One, the world's first unisex fragrance, is becoming an entire lifestyle brand, offering slouchy yet slim jeans, cotton underwear and swimwear. Naturally, the brand will cater to both men and women. The fragrance, which launched back in 1994 (remember those black-and-white Kate Moss ads?), sold 20 bottles worldwide every minute at its peak and is recognized as the best-selling fragrance launch of all time. Look for the debut spring collection in stores this January.

— Kendall Herbst