
The First Lady’s custom-made, powder-blue-and-black dress featured an intricately beaded lace overlay and a voluminous skirt—very on-trend, yet stunningly unique. Photograph by Evan Vucci/AP.

Katie McGrath’s gown won us over with its combination of dramatic silhouette and chic simplicity—with bonus points for the non-floor-length hemline. Photograph by Joshua Roberts/Landov.

Samara Foxx, the wife of Transportation Secretary Anthony Foxx, opted for a flowy ensemble in sapphire, a reliable, always-elegant hue for presidential events. Photograph by Manuel Balce Ceneta/AP.

Blue was the color du jour at the event: Evie Colbert looked stunning in an azure gown beautifully complemented by a prim updo. Photograph by Andrew Harrer/Landov.

Mary J. Blige: Though singer Mary J. Blige entered the dinner in a long-sleeved red stunner, her second gown of the evening was one of our favorites by far. The striking metallic embellishments paired with chiffon panels made for a sophisticated yet edgy look. Photograph by Pablo Martinez Monsivais/AP.