Flared clothing

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)

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)