The outfit I had was very formal (5)

I believe the answer is:

rigid

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'very formal' is the definition.
'rigid' can be an answer for 'formal' (thesaurus). I'm not certain of the 'very' bit.

'the outfit i had' is the wordplay.
'the outfit' becomes 'rig' ('rig' can be a synonym of 'outfit').
'i had' becomes 'i'd' (I'd).
'rig'+'id'='RIGID'

'was' acts as a link.

Can you help me to learn more?

(Other definitions for rigid that I've seen before include "Unable to bend" , "Firmly fixed" , "Incapable of or resistant to bending" , "Uncompromising" , "strict" .)

I've seen this clue in the Evening Standard.

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