There are lots of designer studios in Shahpur Jat, if that's what you're looking for.
Frontier Bazaar, Manyavar
Kala Shree Regalia - Best Bridal Lehenga Shop in Chandni Chowk
I think brand doesn't matter if got good quality clothes with great design at good price. Let me know if you want to buy some, I'll recommend you some places.
Otherwise, if you only want branded clothes only then you can buy everything online. Myntra is the best option to choose from.
Manyavar and lots of good places in chandani chowk. That the hub