Here's the deal I know nothing of children's clothes. I have no idea what 4 means or who it's supposed to fit. That will be your responsibility. I've provided all the necessary measurements for you to decide if it will fit the kid you have in mind. I just don't have the experience. Sorry.
Use the
measurements in the pics to help you determine if this will fit the child. You can hold a tape measure to one of their favorite fits in the same way I have and compare it to help you think of how
this will fit them.