There are a lot of local boutiques
You can check out Rent It Bae in Rajouri Garden for this!
Rohini Sector 7 market near Sai baba Mandir has multiple shops for renting lehangag's and dresses
You could try Wedding Bells-Rent An Attire, Dress Like A Celebrity in Lajpat, Rent A Closet in Nehru Place
Try chandni chowk,Sudhor bhai,kara asharfi ,there are many more options there
Try KATRA ASHARFI, CHANDNI CHOWK, DELHI
Try east delhi lal quater market
Check out Flyrobe in Lajpat Nagar and Rajouri!