Garments adrift in space? (5)
I believe the answer is:
capes
'garments' is the definition.
(cape is a kind of garment)
'adrift in space?' is the wordplay.
'adrift' indicates an anagram.
'space' is an anagram of 'CAPES'.
(Other definitions for capes that I've seen before include "Sleeveless cloaks - promontories" , "Short cloaks" , "may be worn" , "Space for cloaks" , "Cloaks or headlands" .)