Smooth or glossy fabric (5)
I believe the answer is:
satin
I believe this is a double definition.
'smooth' is the first definition.
(similar in meaning)
'glossy fabric' is the second definition.
(I've seen this before)
(Other definitions for satin that I've seen before include "Stain on shiny fabric" , "Silky material" , "Smooth and silky" , "Stain on shiny cloth" , "Material with glossy front and dull back" .)