ASOS started in 1999 and was originally called AsSeenOnScreen. It was a clothing website where fashion fans could buy clothes they'd seen on their favorite celebrities. Soon the brand grew beyond the long-winded name, becoming well-known by just the acronym and they started to offer clothes that went beyond strictly celebrity-inspired. And soon ASOS became the world's number one online clothing brand for young women. Led almost-entirely by catwalk trends and made wearable by ASOS' expert team of designers and stylists, ASOS is the go-to label for fast fashion fans. This collection of men's ASOS nightwear offers stylish pajama sets, lounge pants, sweaters and dressing gowns.