Vintage Disney ariel the little mermaid short sleeve shirt size 8/10?

This is the coolest shirt, single stitch vintage!! There is no size tag but my best guess is 8/10 kids? PLEASE REVIEW measurements in photos!!! The square looking outline on the front graphic is actually a music button I believe? It clicks but no longer plays. I don’t see any stains or holes, but remember this is vintage and all white.