Smart companion to relaxed clothing style (6)

I believe the answer is:

casual

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

'relaxed clothing style' is the definition.
'casual' can be an answer for 'relaxed' (I've seen this before). I am not sure about the 'clothing style' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for casual that I've seen before include "Informal or temporary" , "at ease" , "Informal or blase" , "Workers without fixed employment" , "Of clothes, not formal" .)

I've seen this clue in The Irish Times.

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