Stylish pale blue clothes (6)
I believe the answer is:
swanky
'stylish' is the definition.
(thesaurus)
'pale blue clothes' is the wordplay.
'pale' becomes 'wan' ('wan' can be a synonym of 'pale').
'blue' becomes 'sky' (I've seen this in other clues).
'clothes' is an insertion indicator.
'wan' inserted within 'sky' is 'SWANKY'.
(Other definitions for swanky that I've seen before include "Ostentatious" , "Ostentatiously smart" , "Proud" , "Swish" , "Posh" .)