If I buy something very expensive on Ebay and the seller doesn't ship it WHAT WILL HAPPEN TO THE SELLER?

I am bidding on a $7,000 Dolce &Gabbana coat on Ebay but it is a lot of money and I am concerned. What if the seller doesns't ship it? What if there is something wrong with it? I know that paypal hasme convered but what happens to the seller? Thank you for your time.