The official name of the design is the Lace Linen-Cotton Peplum Midi-Dress. Eugenie’s choice to wear it to such an elegant summer event makes clear its versatility. The peplum top, the gold buttons, even the ornate cut-outs—this is a style that is easily dressed up or down.

In fact, we love how Eugenie chose to style hers—with a neutral mule-style heel from Staud and low-key jewelry—letting the two-piece set speak for itself. (She did add a pop of color via her guava-hued top-handle purse from Chanel.) It’s both summer-ready and simple—exactly the kind of effortless ensemble you want to reach for when the weather gets warm.