Celia Birtwell

Things are looking groovy--real groovy--at Uniqlo this spring. The high-street retailer is collaborating with seminal '60s designer Celia Birtwell on a capsule clothing collection to hit stores in the UK March 21, WWD is reporting. For those of you who don't know, Birtwell is one of London's most iconic textile designers, forever associated with the city's heady days in the '60s and '70s when she, along with her then-husband Ossie Clark, dressed the likes of the Beatles, Rolling Stones, Marianne Faithful, Jimi Hendrix and more.