I am a recycler of the first order. There is a lot of fabric in some clothing and it does make wonderful quilts. I use appliques by machine and make wonderfull art quilts out of silk ties. At first cutting up perfectly good clothing is hard, but once you do it, your minds eye will see lots of possibilities. Set your self free.
I used my friend's fathers clothing to make a quilt for his mother, she loved it, and my friend is now a hero. So go for it.
Rosie