My cats and my housecoat !!!?

This may sound weird but I have a housecoat that I wear and when I have it on my cats go mad for it only the right side of the collar they purr really loudly and knead it claws go in and out and they look as if they are in in heaven when it is laying on my bed they cry for me to put it on this as been going on since that wonderful day they came to us at 8 weeks they are now 2 years and they still love it