As a white lover I just had to purchase light coat. I found perfect looking one at Backstage. The coat is oversize in beautiful milky colour ♥ Backstg site says it's a summer coat, but I'm sure no one kills you if you wear it during Autumn.
The outfit is kinda ellagant because of the white shirt and Marthu's black bow tie. But you can wear this coat with your favourite t-shirt and sneakers ;)
Backstg - milky coat
Marthu - bow tie (you can spy me on their site ;)
White shirt - very simple, that one you've got in your wardrobe. If not, you can find it on Asos.
Leather pants: similar here and here
Paul's Boutique - bag, similar here
Pier One - Ancle Boots
Cluse - Watch