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' is an anagram indicator.
'space' with letters rearranged gives '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" .)