Most of the items can be bought from Raipur itself. But I am listing down all the things you will require at the hostel so that you bring most of the items from your home itself. This will save you some time and multiple trips to the market-
Mattress and pillows can be bought in Raipur itself. Chances are that you will miss out on these items in a hurry, so I am mentioning them as well- T-shirts and shirts, jeans and chinos, socks, pen drive and laptop.
These are a few things that you should carry for your hostel at NIT Raipur.