Ok, I think I'll bring just one jacket for at least the first day and see how everyone else is dressed. I am visiting as the customer (yes, I realize that's strange, but it's the nature of my business), so there's not that need to overdress to impress my customer.

Thanks for the advice. Sounds pretty much like Japan so far, and I've got Japan down to a science. Any big differences I need to be aware of? I'm generally the western Europe person who just got thrown into this Asian stuff recently and my only experience has been Japan so far.