I got rid of most of mine to a charity shop so it will be harder to put weight back on. This included clothes that still fitted (baggy tops etc) but I only bought because I was bigger and knew they would be comfy.
I reckon get rid of them it's another incentive to stay slim when your clothes get tighter.
I'm on a declutter mission. I lost about 20 pounds last year and have a few items to get rid of. Normallly I send everything to the charity shop but I do have a few things in vg condition, good quality (monsoon, banana republic, boden) that I am unlikely to wear again. Should I bother trying to sell them or just get the clutter out of my house and accept the loss? once I decide I don't want something I like to get rid of it quickly so I don't change my mind...
We are going to move house soon and I am trying to get stuff organised.