Hmm....not sure if it will help, as you may already be doing what I suggest. I separately wash the clothing from any other laundry. Wash small loads on the highest water setting. The more room the clothes have to move around in the washer, the less likely hair will cling. One last idea, go outside and shake your laundry before washing.
In the future buy only light colored clothing....the hair is still there, just not as noticeable as on dark clothing