In 1975 she went to London and soon established Herself as a confident successful designer, able to merge Oriental and Occidental ides in a modern manner.
Her product lines include clothing, cosmetics, underwear, sunglasses and watches and are sold in Europe, Asia and North America. Additionally, she claims to be the first designer to market condoms under her own brand name. Some of Koshino's licensees for her main brand umbrella, Michiko London, include Sudo for wool and acrylic scarves, Ta Feng for umbrellas, Shin Myung Mool San for lighters, Chiyoda Bussan for footwear, Mandom for cosmetics, Gunze for tights, and Mitsubishi Rayon for casual apparel.
Koshino's collections also offer a selection of different types of clothes, to provide a whole wardrobe for her customers. Her flagship store in Covent Garden, London, with its DJ mixing tables providing a direct link with the clubs, always shows her full range, spanning the biker-inspired Motor King collection, its title often emblazoned on the stark contrast leathers, the designer name t-shirts and sweatshirts popular with tourists, the sharp, brightly colored suits, and the sexier, more overtly clubby Lycra, viscose, and leather of the Michiko London range.
Koshino's focus in the 2000s has been on three lines: Main Collection, Yen Jeans, and her 100's line.
Michiko Koshino is now the Queen of club culture when it comes to clothes. Fusing urban culture with nightlife, she blends the east and the west with her highly colourful and techno creations.
Her client list includes Keith from "the Prodigy", All Saints, the Spice girls, Placebo, Talvin Singh and Natalie Imbruglia.