On here, once I get my christmas dress, I won't get rid of it.
As for on Gaia, probably my kiki, g pin, chain wallet, etc. Stuff that I have had since I first started.
I wouldn't get rid of any of my DI's. I'd probably sell some duplicate things from chance coins.
The one item I'd never, ever sell is my Emo Panda. I love it so much because it was my first big win with the chance coins.