I'm very very flattered that you like my cosplay dress, but I'm afraid I don't have intentions of selling it. It means a lot to me, as I worked very hard on it, and I still want to hold on to it for future conventions.
I'm sorry, but again, I'm flattered that you like it so much. Might make a suggestion if you want a dress like this? You could always commission someone to make a better quality dress for you (mine is actually kind of badly put together), or you could make one yourself?
Thank you, and I hope you have luck in finding what you want.