I'm an EYFS teacher. Please avoid tights, playsuits, laces in shoes and anything else your child can't do 100% independently. Elasticated trousers, jogging bottoms if they are permitted, and Velcro shoes are the best thing. Of course the teacher will help your child, but the children will want to get back to playing ASAP. Laces trail in wee, water, paint, mud and everything else. So do skirts, as most 4 year olds take everything down when they use the loo.they find it hard to do "skirt up, tights down" as we would, when they use the loo.