hmm. looking back, I think I "disobeyed" my parents by gradually demonstrating my autonomy. for example, you don't have to disobey them right away by not wearing the puffy jackets altogether--but start asserting your choices by emphasizing how you want to be the one who chooses the style and design of your parka, for example.

ideally, that way your parents will have to see you as a partner in this making this rule about wearing the parka. and maybe eventually they will be able to accept your autonomy to the point where you can refuse to wear the parka altogether, because they see you're capable of knowing what's best for yourself.

not that you should have to prove to them you're responsible just to have your autonomy taken seriously--but could be a place to start?