For us it was starting very early and being persistant. When we first put a dress on KS, she nipped at it. She never got it off, but would nip at it. After a couple of days and from then on, she just ignores it. I think she even looks forward to dressing. When she sees me coming with a dress she hops up on her seat and sits like a good girl. So just keep at it and lots of praise. Good luck!