You can test this out for yourself.

I think this is part of ‘old knowledge’ that has been largely forgotten.
I was taught this as a young boy by my Uncles farm manager.
I’ve experimented with it here. I usually wear overalls, or very similar trousers and top. If I change my appearance drastically the chickens won’t approach me and tend to back away until the ‘new me’ has been imprinted, I’ve assumed.
Hoodies, hats, vivid colour changes, flappy garments, carrying unfamiliar objects, all tend to unsettle other animals.
For those who keep their chickens in runs, it probably isn’t so important because there isn’t anywhere for them to run.