be dressed (up) to the nines

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be dressed (up) to the nines

To be very well-dressed and fashionable, typically for a formal event. I have to be dressed to the nines at this gala tonight—a lot of important people will be there. The whole family will be dressed up to the nines at the wedding, I'll make sure of it.
See also: dress, nine
References in periodicals archive ?
They are dressed to the nines, the oh-and-nines, and the fashion police have hit the siren.