Short answer
Only on Sundays, roughly 9 AM to 6 PM, near Doordarshan Kendra Colony in the GIDC area. It is known for cheap fabric and a live cloth auction.
Ravivari Bazaar opens only on Sundays, roughly 9 AM to 6 PM. Go early for the best cloth lots.
Tell us what you're looking for and we'll point you to the right market or supplier.