I’m gonna have to agree with Micki here... you put yourself in the awkward position when you brought it, not when you left it. The cat was out of the bag the minute she walked into that bathroom. In my opinion, I think you’ll not only get your nightgown back by asking for it, and you may find talking to your friend about it very cathartic. And you may come out of it with a new ally that you can speak freely with.

Hate to say it sister, but she knows. Leaving behind a XL nightie is a tell!