little black dress

noun

She wore a little black dress to the party.

意味（1）

A simply cut and often quite short evening or cocktail dress.

意味（2）

(figuratively) Something simple, versatile, and elegant; something that pairs well with many other things.

意味（3）

(fandom slang) A character who is shipped with many other characters.

I've seen Snape/Loki. Little Black Dresses, both of them. They'll go with anybody.