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One may be dressed up to them - by numbers? (5)

Ross

I believe the answer is:

nines

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'numbers?' is the definition.
(nine is a kind of number)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for nines that I've seen before include "In emergency, press three of these" , "Dressed to these is to be perfectly turned out" , "squares" , "Dressed to these and you're well-turned-out" , "Numbers to which one may be dressed up?" .)

I've seen this clue in The Globe and Mail.
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