N-2 Designer Studio is a great place for men to shop at. Though technically, it's not a shop for readymade garments. They have sample pieces of sherwanis, coats and three-piece suits, and you can order to get customisations and fittings done; this will take a couple of days. We quite liked their waist coats.
You can find coats here for about INR 2,500 and above.