Fellow business women – what do you wear in the sweltering heat still looks sharp?

Hi All — I'm moving to Tokyo with my family this summer and will have a corporate job in Tokyo. I've lived in Japan before many years ago and it was hot then — and from what I hear it's even hotter now. I've got fair skin and tend not to do great in the heat so I'm keen to plan ahead if I can.

What clothing recommendations do other professional women suggest? What are your key clothing pieces you couldn't do with out? Are bare legs still a no no? Bare shoulders/capped sleeves? (I was in inaka, so forgive me if this is outdated). Thanks for any suggestions!