Winter jackets
 

I just bought one of those winter jackets with Sinchi material and a fleece back (cool Liquigas team replica, but that's neither here nor there). Anyway, does anybody know how these are generally supposed to fit? Do you wear it with just a base layer (sort of like a really thick jersey), or are you supposed to be able to fit a long sleeve jersey and base layer underneath? Obviously, it's weather dependent, but I'm thinking mine might be too small. Just wondering. Thanks.