Goonj is an NGO which contributes cloth and other necessities to rural communities as reward for labour. They are accepting donations all year round, and now is the best time to dig out your things.
They are accepting children’s clothing, saris, old toys, books, school materials, office equipment, furniture, footwear {all in good, usable condition}
It is headquartered in Delhi, but has centres across India. Here is a list of the dropping centres in Mumbai, and how you can contact them.