It’s a fluorescent safety vest. For, you know, crossing the road (heh heh).
Here is a chicken in a safety vest. This is real life.

omlet.co.uk
The company Omlet also sells clothing for chickens:

omlet.co.uk
SHUT THE BARN DOOR, THIS IS A CHICKEN IN A TWEED VEST

omlet.co.uk
Oh, hello you handsome fellow. Nice wool jacket.

omlet.co.uk
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