I live in a country with no winter ever, no cold, no snow! But il be in a country with winter and snow and a country where half the year is gonna be cold. Im not very aware of the way I should dress though. Winter clothing I mean (short handy jackets of various colors and all kinda overcoats). So what I think is I should wear jackets and overcoats over my ordinary clothing and inners inside when im out walking or travelling, but I take it off when I get indoors at a café or supermarket or maybe my University for classes and again put it back when I go out. Right? Or do I keep the winter clothes on over my ordinary clothes all the time no matter im indoors or outdoors without taking it off until I get back home?
Please correct me if im wrong. Just don't wanna look funny or get embarrassed by wearing the wrong way.

Thank you all