A shift dress, a sheath dress, shirts, blouses, culottes, tunics, pants/trousers, skirts- these are all Western formals. You could also wear Indian formals such as saree, kurti, leggings, salwar suit. For western wear you can go to UCB, H&M, Zara, Madame, Arrow, Tommy Hilfiger, Goyal Sons, Van Heusen and can also check Sarojini Nagar Market. Indian Formals can be purchased from Global Desi, Madame, Incence, Pantaloons, Sarojini Nagar, Kamla Nagar