At today's engagement, Kate paired the coat with a black Alexander McQueen belt (seen previously), thick black tights and her Aquatalia Rhumba boots.
The Duchess finished off her look with her Kiki McDonough citrine drop earrings.
Current speculation is that Kate is wearing a burgundy Whistles 'Sofie Rae' dress ($135 from a previous season and no longer available) under her coat. The dress is described as pure silk in a warm seasonal burgundy. It has a deep v-neckline, long sleeves and a flattering defined waist. A floating midi skirt and removable belt.