Does business formals exclude khakis/chinos? Only dark trousers and light shirts allowed?
Wear a complete suit. Some people in India are stupid and observe how you dress during interviews.
Have you been living under a rock? Most interviews all over the world require you to dress formally. I am interested in knowing how you drew the conclusion that some “stupid Indian people” do it. I guess you are one of those “stupid” people.
I have done all my interviews in US in tshirts, shorts and flip-flops. I ended up with 11 offers after I completed MS. In India, I had to wear a complete suit for all the interviews. In one of them (may be zs associates?), interviewer pointed out that my shirt isn't ironed well enough.
Why would business formals be different for Bangalore? Special concession for flip flops and floaters ?
Business formal is effectively a suit. Chinos/Khakis can be considered business casuals if paired with a shirt.