Crossword Genius

Refinements that used to go with smart shirts? (8)

Ross

I believe the answer is:

niceties

'refinements' is the definition.
('nicety' can be a synonym of 'refinement')

I cannot understand how the rest of the clue works.

(Other definitions for niceties that I've seen before include "Shades" , "refinement" , "delicacies" , "Fine points" , "Delicacy" .)

I've seen this clue in The Guardian.
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