The Formal Dress variation is the most formal, and is identical to the Dinner Dress Blue Jacket uniform but worn with a white waistcoat with gold buttons in place of the cummerbund, a white bow tie, and matching mother-of-pearl studs and cuff links
I bought it a few years ago from Amazon, and it's still available
An essential choice for bedroom/living room/office
Bottoms: Black buckle-detailed pants or a structured skirt with metallic embellishments, adding a high-tech, avant-garde feel
20 Kate Middleton Casual Style Getty Images For the Duke and Duchess' royal tour of North America, Kate opted for a more casual look, with a khaki-hued button-up shirt, blue jeans, white and khaki boat shoes, and a utilitarian brown leather belt