Hi guys, going Japan today, visit Tokyo and Sapporo
Already got inner sweater, light down vest, and outer jacket ( for snow and below degree condition ).
I heard/read that I will need another jacket ( for Tokyo ~ 10 degree ), got few jacket option so want to ask sifu here which is best:
Sweater jacket ( not wind proof )
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Regular jacket ( thick double layer polyester )
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Rain jacket ( super light weight packable type )
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I wear the rain jacket at Taiwan when typhoon boarding and I sweat like at hell

so I was wondering if I could just bring that one and ditch the thick sweater/jacket and save some space/weight.
Dont understand your question....since you already have outer jacket, can you still fit any of this jacket? What is the purpose? For the wind? Also if you go into any shop, it will be damn hot and you will need to "strip down". If you wear so many layers....good luck!. Now in Tokyo, I wear my normal working clothes and then a thick jacket, and a scarf. Its really cold and chilly and when wind blows, the scarf really helps.