There isn't a size on the vest that I can see, but I had my kids try it on- ideally I'd say a size small. My kids are a youth medium and large and it would have worked for them too. Cute little set! Check out the rest of my closet as I haveore pirate costumes!🏴‍☠️ Smoke and pet free home 🏡. Ships 📦 same day or next day. I ❤️ offers & bundles! New to Poshmark use code Kruther20 to save $10! Set sail on an adventure with this pirate costume for kids. Featuring a striking black and red design, it's perfect for imaginative play.