In the episode The Climb (S03E06), Loras Tyrell is talking to Sansa Stark about their pending wedding, and he says:
I've dreamed of a large wedding since I was quite young. The guests, the food, the tournaments. ... And the bride, of course! The most beautiful bride in the world, with a beautiful gown, of gold and green brocade, and French sleeves.
Is there an in-universe explanation for the use of the adjective "French"? Does the nation of France exist in this universe?