Flowing robes, not at all tight? (5)
I believe the answer is:
sober
'not at all tight?' is the definition.
'flowing robes' is the wordplay.
'flowing' is an anagram indicator.
'robes' anagrammed gives 'SOBER'.
(Other definitions for sober that I've seen before include "Sedate - staid" , "Not intoxicated" , "not moved" , "Abstemious - grave" , "Temperate" .)