A feature of simple attire (5)
I believe the answer is:
light
I believe this clue is a triple definition!
'a feature' is the first definition.
(thesaurus)
'of' is a link.
'simple' is the second definition.
(thesaurus)
'attire' is the third definition.
(I know that light is a type of smoking equipment)
(Other definitions for light that I've seen before include "Falling short of contract" , "Settle" , "Illumination - not serious!" , "answer to clue" , "Undemanding; crossword answer" .)