Singular garment, evidently floral (7)
I believe the answer is:
bloomer
'singular' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I can't see?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for bloomer that I've seen before include "Large loaf; or, a mistake" , "Crusty loaf" , "Mistake (colloq.), loaf" , "Big mistake" , "Something from the baker" .)