Those worn in a production of Tosca? (5)

I believe the answer is:

coats

I'm a little stuck... Click here to teach me more about this clue!

'those worn' is the definition.
I can't judge whether this definition defines the answer.

'production of tosca?' is the wordplay.
'production of' indicates an anagram.
'tosca' is an anagram of 'COATS'.

'in a' acts as a link.

Can you help me to learn more?

(Other definitions for coats that I've seen before include "Outdoor garments" , "Layers" .)

I've seen this clue in the Evening Standard.

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