I am size 18/20 and I have various clothes starting size 10. I just can't seem to bring myself to throw away the nice stuff that I used to be able to wear.
Also, when I yo-yo diet (right now I am at the top of the yo-yo!), I've learned not to throw away the bigger sizes.
What does everyone else do? Is this holding onto stuff part of the psychology that prevents me from changing my diet permanently?