Crossword Genius

Wearing costume is the same, after trendy start (2,7)

Ross

I believe the answer is:

in uniform

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'the same after trendy start' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'wearing costume' is the wordplay.
'wearing' becomes 'in' (as in being 'in' certain clothes).
'costume' becomes 'uniform' (both can mean clothing).
'in'+'uniform'='IN UNIFORM'

'is' acts as a link.

Can you help me to learn more?

I've seen this clue in The Daily Express.
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