Swaggering Virginia bolsters underwear before party (7)

I believe the answer is:

bravado

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'swaggering' is the definition.
(I've seen this before)

'virginia bolsters underwear before party' is the wordplay.
'virginia' becomes 'va' (US state abbreviation).
'bolsters underwear' becomes 'bra' (I can't justify this - if you can you should give a lot more credence to this answer).
'before' means one lot of letters go next to another.
'party' becomes 'do' (do can informally mean a party).
'va' put after 'bra' is 'brava'.
'brava'+'do'='BRAVADO'

Can you help me to learn more?

(Other definitions for bravado that I've seen before include "Swag" , "Swaggering confidence" , "Showy boldness" , "Boastful threatening" , "Vaunted courage" .)

I've seen this clue in The Independent.

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