One Direction's Harry Styles covers up that curly hair with a beanie hat at Heathrow Airport

Harry Styles's attempt at covering his trademark tresses doesn't fool anyone

Harry Styles

First it was those crazy jumpsuits, now Harry Styles and his One Direction band mates have adopted a new off-duty uniform.

When Harry, Louis Tomlinson and Zayn Malik landed at Heathrow from Sweden this week, they were all wearing woolly hats – every celebrity’s style shorthand for achieveing that oh-so-on-trend off-duty look.

One Direction‘s stylist Caroline Watson puts together One Direction‘s wardrobe with a mix of custom-made pieces and a range of affordable high street buys including River Island, Jack & Jones and Topman.

We One-der what’s the next style trend Harry, Zayn and the boys are going to set?