what rule does mcmurphy dispute? why? how does nurse ratched react to mcmurphy's behavior? who win's?

Then she hears McMurphy singing. He steps out of the shower in a towel and stands in front of her. She tells him he cannot run around in a towel, and he prepares to drop it, telling her that someone stole his clothes. Ratchet insists Mcmurphy wear the required green uniform. In the end Ratchet loses control and starts yelling for a green uniform, I'd say McMurphy wins that one!