Dressed in regalia - or went back to bed? (5)

I believe the answer is:

robed

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'dressed in regalia' is the definition.
'robed' can be an answer for 'dressed' (robing is a kind of dressing). I am unsure of the 'in regalia' bit.

'or went back to bed?' is the wordplay.
'went back' says the letters should be written backwards.
'to bed?' becomes 'bed' ().
'or' backwards is 'ro'.
'ro'+'bed'='ROBED'

Can you help me to learn more?

(Other definitions for robed that I've seen before include "Wearing judge's garments" , "In a long garment" , "Attired" , "Dressed" .)

I've seen this clue in the Sydney Morning Herald.

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