G.O.T. stands for Game of Thrones, a game, book, and TV show. Sadly, it's EXTREMELY inappropriate. I've never watched, read, or played any of their games, but the reviews (and my mom) have given me a pretty good idea of its disgustingness.
The maker is a third-party (meaning not official GOT), and it has many, many pretty customization options you can check it out here:
Warning: some of the dresses are not modest. They aren't terrible, though, and there are plenty of good options.