Refinements of pleasant neckwear (8)
I believe the answer is:
niceties
'refinements' is the definition.
('nicety' can be a synonym of 'refinement')
'pleasant neckwear' is the wordplay.
'pleasant' becomes 'nice' (similar in meaning).
'neckwear' becomes 'ties' (I've seen this in another clue).
'nice'+'ties'='NICETIES'
'of' acts as a link.
(Other definitions for niceties that I've seen before include "refinement" , "delicacies" , "Delicacy" , "Shades" , "Degrees of precision" .)