Are you going to be indoors more or outdoors? If you are always indoors I would do away with the long johns la, your down jacket would be good enough.
The problem with long johns is you cannot take them out if you are feeling too hot indoors!
Another thing is your hotel; many hotels in central/eastern areas do not have central heating, and sometimes the aircon also don't have heat function! So it can be quite unbearable this way...I fallen sick twice because of that. Make sure your hotel's Aircon has heat 制çƒ* function.
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