It was only four months ago that Princess Mary wore this breezy YDE jumpsuit [1]. We were drawn to the design's cobalt shade at first; how could we miss it? But despite its special details — that high neck, those sophisticated pleats — it called for a little something extra. The Danish royal secures a skinny studded belt around her waist no matter the occasion.

For an event at the ambassador's residence, Mary also accessorized with hoop earrings [2], her Cartier love bracelet, and a few more golden jewels. But she remained devoted to the rest of this go-to look. You can execute the princess's belt trick [3] over a maxi dress, a flouncy midi, or your own culotte jumper. Just read on to see how Mary pulled off her loop with a twist, then shop for belts that'll help you get it done.