The Disappearance

On my way to chess club after school, I noticed that my coat was not on the hanger. How strange, I thought. It was here a few minutes ago when I was packing up. I decided that I had probably forgotten and didn't even come in a coat and mixed it up with the day before. I asked some of my friends if they remembered if I came in a coat that day, but all of us being so absentminded, no one had noticed and they all said that they don't know. Their answers hadn't helped me a single bit. After a bit I forgot about my lost coat, but after a few days remembered about it again.