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!
picha
zaini hats
beanie hats
ski hats
snow hats
baggy hats
louis tomlinson beanies
Louis Tomlinson
One Direction
This One Direction picha contains
suti biashara, biashara suti, wamevaa vizuri mtu, suti, suruali nyayo, pantsuit, mtu wamevaa vizuri, suti ya suruali, bridesmaid, msichana wa heshima, and mjakazi wa heshima.
There might also be
suti mavazi, mavazi kamili, tailcoat, mkia kanzu, mikia, nyeupe tie, nyeupe tie na mikia, suti ya mavazi, mavazi ya kamili, kanzu ya mkia, tai nyeupe, tai nyeupe na mikia, ishara, bango, maandishi, ubao, matini, ubao wa chokaa, outerwear, and overclothes.