I purchased a coat for my chicken a little while ago as she had become very "active" with my flock cockerels! I've had no problem with the coat she didn't even make a fuss when I put the coat on she worn it almost with a sense of pride!! I went outside to sit with the chicken for a while today when the chicken with the coat came casually walking out of the coop covered in straw! I asked her "what the bloody hell happened to you!?!?!" But she paid me no mind and sauntered of out into the grass. I thought perhaps that she had gone into the best box and had a bit of a flap around somewhere flicking all the straw up over her back. When I watched her out in the grass she was actively picking up straw, dry grass, bits of dirt and hay etc and putting them all over her back! And she continued doing that for ages!! I've never seen a chicken do that before? What's it all about???? Something to do with the coat? Maybe the feathers and growing through and itching?!?