Little Burgundy is a huge store and has really nice formal tops and leggings (the collection starts at INR 300). You can find it on the ground floor of the Eros City Square mall. They largely do women's and kids' wear, and you're certain to find stuff worth buying here. I recommend you browse through their collection properly before you buy, as the store is huge and has a lot of stuff in solid colours that are perfect for office wear.