These are black and white underwear items on non-binary third person (6)
I believe the answer is:
zebras
'items on non-binary third person' is the definition.
I can't tell whether this defines the answer.
'these are black and white underwear' is the wordplay.
'these are black and white' becomes 'ze' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'underwear' becomes 'bras'.
'ze'+'bras'='ZEBRAS'
Can you help me to learn more?
(Other definitions for zebras that I've seen before include "Striped horse-like animals" , "Striped beasts" , "Black and white African animals" , "Striped mammals" , "certain quadrupeds" .)