Oxford shirt by Calvin Klein, Smart thinking, Button-down collar, Branded design, Chest pocket, Button placket, Regular fit, Just select your usual size, Exclusive to ASOS. With a rich company history spanning back to 1968, Calvin Klein originally started life as a coat store in New York City. The now iconic label, famed for their minimalist approach, offers up covetable diffusion lines CK by Calvin Klein and Calvin Klein Jeans, both of which channel the label's inimitable style.