Appearing in robes entirely too voluminous (5)

I believe the answer is:

obese

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'voluminous' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I don't see?

'appearing in robes entirely too' is the wordplay.
'appearing in' indicates a hidden word.
'OBESE' is hidden in the letters of 'robes entirely too'.

Can you help me to learn more?

(Other definitions for obese that I've seen before include "Abnormally fat" , "Stout" , "Morbidly overweight" , "Very substantial" , "having generous corporation" .)

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

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