I guess I've been a little out of it with Ralph Lauren bedding - I didn't even realize they had started Lauren Spa. It's a collection of 100% organic bedding and bath items including the Desert Retreat collection below. They use certified organic cotton, it is both GOTS (global organic textile standard) and Oeko-tex certified.
Ralph Lauren Spa Desert Retreat Leopard Duvet Cover
I love the way it's leopard, but subtle. It doesn't scream leopard at you, which is a good thing! The full/queen duvet cover is on sale for $209.99. It doesn't mention the thread count, but it is long staple, organic cotton.