Pretending to be donning a garment? (7,2,2)

'donning a garment?' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'pretending to' is the wordplay.
I cannot really understand how this works, but
'to' is found in the answer.
The remaining letters 'puttingin' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'be' is the link.

Can you help me to learn more?