Terribly sober attire for judges, perhaps (5)

I believe the answer is:

robes

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'attire for judges perhaps' is the definition.
I can't judge whether this definition defines the answer.

'terribly sober' is the wordplay.
'terribly' indicates an anagram.
'sober' is an anagram of 'ROBES'.

Can you help me to learn more?

(Other definitions for robes that I've seen before include "Sober (anag)" , "Gowns" , "In official costume" , "Attire" , "trappings of office?" .)

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