Louis has been spotted in this hat so many time and eventually we managed to track it down. It's a Zaini beanie hat and can be bought from www.zaini.com. His particular style is called 'Lomond' and if black and white - great hat!
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zaini hats
beanie hats
ski hats
snow hats
baggy hats
louis tomlinson beanies
louis tomlinson
one direction
This One Direction photo contains
business suit, well dressed person, suit, pants suit, pantsuit, bridesmaid, and maid of honor.
There might also be
dress suit, full dress, tailcoat, tail coat, tails, white tie, white tie and tails, sign, poster, text, chalkboard, outerwear, and overclothes.