What is the proper business attire for an american traveling in India?

the same as here...

uh, nvrrrrr...minddddddd..............teehee

long sleeve white linen dress shirt. casual trousers, like a nice pair of well fitted khakis, black leather sole shoes and black belt. depending on what part of India, it can get a little chilly in the evening, so a light sport jacket.
Remember long sleeve shirt. There is a dengue fever epidemic, they dengue mosquito bites when the sun goes down and you will get very sick.