Here's a simple recipe for keeping your fabrics soft and fluffy. It's a lot gentler on your clothes, than commercial fabric softeners and much easier on your wallet as well.
1/4 cup baking soda
1/2 cup white vinegar
Fill washing machine with water. Add baking soda and then the clothes.
During the final rinse cycle, add the vinegar into your fabric softener dispenser if your washing machine has one (or add directly during the rinse cycle.)