So I'm taking beloved 3 year old on holiday for the first time. I've heard reports that you shouldn't allow children to wear tshirts in the pool because they can cause sunburn to escalate at a higher rate (something to do with the air between skin & cloth causing a massive increase in heat). However, I've now been googling this and can't find any information to justify my opinion. Is this a red herring? I have a UV suit, plus a rash vest for her but she loves her swimming costumes and know she's going to want to wear these. I'm a bit confuddled!!!