Thank you for viewing. This is a Sofia the First Disney Princess vest. My family used it indoors. We used to wear it over pajamas when it was cold, or just sleep in it. It's not as big as a sleep sack, so it's convenient when it's a little cold at night or in the morning. It's a button-up type, so you can take it off while the child is sleeping if they get too hot. It can also help children practice buttoning. There are some pills. Please check the photos. Please understand that this is a used item before purchasing.