Why do we hold on to clothes we never wear? What is the allure of owning so many things? I believe that keeping unuseful things could be supported by a fear of poverty, a sense of guilt, or an unwillingness to move away from the past.
I have heard so many times "Oh, I may need those, so I don't want to get rid of them." If you haven't worn an item in a year and can't seem to get rid of it, think about it...do you believe that you will not afford to replace it if the time comes? This kind of thinking leads to hoarding because there are so many things that you "may" need. We have to trust the universe to give back to us when we need it. You reinforce this theory with others when you give away what you have to provide them what they need. I guess you could call it clothing karma.
Look through your clothes, one at a time, and see what emotions you feel as you behold each one. Did you spend too much money on that blouse? Are you still waiting to wear that sparkly dress to a party when you rarely go to parties? Are all those pants too small on that side, too big on the other side? When you feel guilty looking through your clothes, it makes you feel stagnanted. You don't want to deal with a stagnated closet, and others don't want to deal with a stagnated you! Get rid of the guilt by getting rid of those unneccesary clothes.
Start moving on, by letting go of those old memories, sizes that don't fit you, and a fantasy life that you don't live. When you see a clear view of who you are right now, it gives you a peace in your mind. You don't have to deal with the clutter of your past, or any failures when you look at your clothes. By releasing these past "sins" from your home, you can finally forgive yourself for not being that old size. Be who you are at this very moment. You are the one who decides what to keep and what to let go. You know the offenders and what is keeping you from moving forward.