Crossword Genius

Fitting a soft type of shirt (3)

Ross

I believe the answer is:

apt

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'fitting' is the definition.
(both mean appropriate)

'a soft type of shirt' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
'soft' could be 'p' (musical abbreviation for piano, 'soft') and 'p' is found within the answer.
'shirt' could be 't' (as in a T-shirt) and 't' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for apt that I've seen before include "clever" , "Liable" , "may be appropriate" , "To the point" , "Apposite, appropriate" .)

I've seen this clue in The Sunday Times and The Times.
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