The term 'dressed to the nines' is an idiom that means to be dressed in one's finest clothing. It is believed to have originated from the phrase 'to the nine, ' which was used to describe something that was perfect or of the highest quality. The crossword solutions for this term are NATTY (5 letters), DUDEDUP (7 letters), DOLLEDUP (8 letters), DECKEDOUT (9 letters), and ALLGUSSIEDUP (12 letters). All of these words can be used to describe someone who is dressed in their best clothes.