Waiting for airport shuttle bus in Chongqing airport - What to wear?

Can i wear a breathable shirt, a microfleece and a jacket to wait for airport shuttle bus in airport? I have no down coat. Will these layers keep me warm? Or is it suggested to buy an air ticket of T3 airline operator and arrive in the same Terminal 3 from Nanning? I have to catch an outgoing CQ Airlines flight to Phuket.