Reversible vest (3)
I believe the answer is:
bib
This could be a double definition.
'reversible' is the first definition.
'vest' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?
Can you help me to learn more?
(Other definitions for bib that I've seen before include "Protective apron" , "Upper part of apron" , "Young diner's protector" , "Protective garment" , "Child's garment protector when eating" .)