Some accoutrements being de trop (5)

I believe the answer is:

outre

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'de trop' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

'some accoutrements being' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'OUTRE' is hidden within 'accoutrements being'.

Can you help me to learn more?

(Other definitions for outre that I've seen before include "off the beaten track" , "Extravagant, rather shocking" , "Shocking - route (anag)" , "Shockingly unconventional" , "Not abiding by what is proper" .)

I've seen this clue in The Everyman puzzle in The Observer.

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