Kate Middleton's Impressive St. Patrick's Day Style Evolution.

Kate Middleton usually wears green for St Patrick's Day, but in 2015 she wore a grey Catherine Walker coat instead, possibly due to being heavily pregnant. She has since returned to wearing green for the annual event, often opting for military-style outfits from designers like Alexander McQueen or Catherine Walker. Kate recently broke her own style tradition by wearing a navy peplum skirt suit by Erdem for the Commonwealth Day service.