Family T-Shirts

Whenever we go on a family vacation, I will somehow get paranoid that my S2 will wander off on his own and get lost. I know he is already 11 years old, but that doesn't stop me from worrying. I actually told H that I wanted to get Personal Creations Tshirts for all of four of us .... All the T-shirts will have the same colour and have a distinctive look that is uniquely for our family. And if any one of us gets lost, we can report "so and so is wearing exactly like me"! Good idea?