Markle chose a black tank top and black silk taffeta ball skirt ($2,390) from the brand’s Icon collection, pulling her hair back into a sleek bun and keeping her accessories and makeup minimal.

She paired the shoes with a black pleated taffeta tea-length flared skirt that hit just below her knees, a simple crew-neck T-shirt, and an unbuttoned black knit cardigan that added a subtle pop ...