Need outfit suggestions for my first full-time job

I've got an offer from Deloitte Bengaluru campus and since this is gonna be my first job in a big corp, I have absolutely no idea what clothes I should be buying. My wardrobe consists of school girl/teenage clothes at this moment so I'm considering getting all sorts of clothes from scratch.

I've also heard that big corps don't really impose formal clothes anymore and most employees dress up in work casuals. What's your suggestion grapeviners ?