I remember very little about this story. There is a party where Rachel is wearing what she calls a dress, and Puck thinks is a shirt. He drags her into a bathroom at the house and they get into a fight about her clothing. Then I blank out and don't remember anything until the end, which is Puck finding the 'dress' on a shirt rack. There is a brief mention that the short dress was Santana's idea but we don't see that actually happen in the story. I don't think they are in a relationship at the beginning. I'm pretty sure it was a one-shot, and I'm 90% sure it was on LJ. Ring any bells?