I am using the Oliver + S, Tea Party Sundress pattern. For me, this is now a TNT pattern. So I don't really mind sewing it. I know it will go together quickly and turn out well. Also, Oliver + S patterns are expensive, $16, and they are never on sale for 99 cents like the big 4 patterns, so getting a lot of use out of the pattern makes me feel that I am amortising my costs!
This dress is designed for summertime, of course, but I think it will be fine layered under a long sleeved t-shirt. Instead of lightweight quilting cotton, I have chosen a heavier, nubbier cotton from Lecien, which I think makes it more wintery. I found the fabric at Quitlers Cloth online.