Flared clothing
From Tardis Wiki, the free Doctor Who reference
While glancing at clothing, specifically trousers, Mel Bush was told by Kathy Beale that flares were back in fashion and that everything from the last century was. (TV: Dimensions in Time)
Behind the scenes
Information from invalid sources
Flared clothing was worn by some individuals on Earth in the 1970s; it consisted of clothing with fabric which caught the light in iridescent patterns.
For example, Dez Skinn wore flared clothing and platform slippers to bed in 1979. (NOTVALID: The Origin of Doctor Who Magazine)