Crossword Genius

Apt phrase to describe party wear (5,4)

Ross

I believe the answer is:

paper hats

I'm a little stuck... Click here to teach me more about this clue!

'describe party wear' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'apt phrase' is the wordplay.
'apt phrase' can be anagrammed to 'PAPER HATS'.
Though, I'm not clear how the anagram is indicated.

'to' acts as a link.

Can you help me to learn more?

(Another definition for paper hats that I've seen is " Party headgear".)

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