How do you tag kid’s clothing?

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I thought I’d used myLot for a practical problem I have at the moment. Maybe I could get some good suggestions from more experienced-parents in here. My son brought home his new Gym shirt today. It is black, with their school logo at the front, and their school character at the back. It is made of 100% Polyester. I need ideas on how to tag or identify it so it doesn’t get lost. All the kids in their school have this shirt. And depending on the day, some grades would have their ‘Gym-day’ on certain days of the week. So the kids would have to change during those days from their uniform, to the gym shirt, and back to the uniform before the end of the day. It’s pretty common that kids mix up their clothing and some lose their gym shirt, or their gym shorts. My son already lost a pair of shirt and shorts. What’s the best way to put identification on a black polyester shirt?