dressed to the nines

Dressed to the nines is an idiom which is describing someone who is dressed smartly or flamboyantly. It is most frequently heard when attempting to explain the fact that the clothing has something in the quantity of nines to explain how extravagant and flamboyant it is, such as a jacket with nine buttons which would be a lot for that style of jacket. Another theory is that tailors once used nine yards of material to make a suit of this caliber.