Another cupboard item that can tame a fabric - white vinegar.
Soaking your fabric in water with a little vinegar before the very first wash will help to lock its colours in. This is rather useful for fabrics that tend to lose colour a lot, such as denim. Just add half a cup of white vinegar to a bucket of cold water, and let your fabric soak in for 30 minutes before putting it in a wash.
Very often it does not take much to improve something. Take care of your wardrobe - it is part of your world!..