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- Dramatic cathedral train

Ahead, we're bringing you everything you need to master the black-tie dress code for guys

Excuse the wrinkles, we didnt get the iron out for this photoshoot, but the find is great

- Curved bandeau neckline with a silver-encrusted jewel trim

On Thursday, Catherine, Duchess of Cambridge made a bold fashion choice, stepping out in a red-hot number for her mother Carole Middleton's 64th birthday party

Gomez, too, is something of an LBD connoisseur and in recent months, has been wearing the closet staple for countless public appearances, sometimes donning dual black dresses only a few hours apart