Summer dress- large

Cute as colorful summer dress! The back has an X style tie. Waist is stretchy. Purchased from another Posher but it's fits a little too tight. Purchased as is with no tag. I believe this may be a large in junior size..? It's too tight around my bust area. Or I may be too busty for this style. 😂😩 Pit to pit; 20.5" Length: 38.5" shoulder down Nonsmoking home