Hi everyone....this is slightly different than layover at NRT thread... I'll have a 12 hour day in Tokyo - arriving HND early, departing NRT evening in January. I'll be coming from Sydney so will have mostly summer clothes. I'll bring a coat but not all my winter stuff as I want tp pack light in OZ. Any thoughts on spending a day and transferring airports with my carry on that might keep me warm?

I know Tokyo fairly well, but many here have more ideas/experience that me..... I have a good friend in Tokyo but she's out of town that day which is a bummer.

Arriving at HND business class ANA so will use the shower room. Then....? Any tips suggested.