I remember seeing Google folks in Japan coming to sell their products in T shirts and jeans in a business world where everyone wears suits and knows it. I have nothing against the casual style, but knowing the etiquette is primordial in business.
I honestly cannot imagine the words ‘sales’ and ‘no suit’ together in a sentence anywhere in the world, much less Japan.
I’m not even Japanese and I think by now I’d consider it more or less an insult.