So, I think, go with the ballet text. I don't think there's anything wrong with mentioning something that you remember as being super-fun from the past. You're not doing it in a pressuring way at all, but starting some communication. I agree with the others- don't overthink it!
Halternecks are great for swimming in, and looking hot when you come out at the other end. What more could a melon-girl want? I'm so happy that you and your friend loved Bravissimo! Their stuff is so fabulously awesome- very TTTTTTTTransformer!!
