SarojiNi or Palika Bazar
Yashwant Place should be your go to for Leather Goods including great jackets. You can also try Da Milano stores.
Go to paharganj and look for sheik leather. They have amazing anything you might need to do with leather stuff!
Check out Monika Leather Emporium in Yashwant Place.
Sarojini has it all , Lajpat Nagar can be also tried
Yashwant Place commercial complex, opposite post office, Satya Marg, Chanakyapur
Cost: Rs 1000 onwards
2.Meena Bazaar, Jama Masjid, Chandni Chowk
Cost: Rs 700 onwards