I had to send my nephew Murphy to school one day, and here is the email I sent his teacher:
Anne, Murphy doesn't have his backpack because I was unable to get into his house this morning. I sent him with my backpack. (I threw in some underwear and fresh socks/flip flops just in case.) That dress he is wearing is not a dress. In fact it's my sweatshirt. It is acting as a coat, as I forgot to grab his. He doesn't have to wear that huge thing all day if he wants to take it off.
The blank piece of paper in the backpack was supposed to be a note to you, but I had no pen.