Most children are not naturally tidy. They love to get all those blocks or other toys out to play with, but they don’t like the job of picking them up off the floor and putting them away. Unless they are taught to put their clothes away, they will no doubt stay on the floor or wherever they landed when taken off.
Training your child to be tidy need not be a hassle, but be warned; if you are not tidy yourself, don’t expect your child to be. Children copy what their parents do and if they live in an untidy environment will see no reason to be any different. That said, most parents realise that life is easier and more pleasant when the home is relatively tidy. At least they don’t waste time or get frustrated looking for important things that just disappear into the general mess.