Duke Kahanamoku vintage Hawaiian shirt XL

Satin embroidered label “An Hawaiian Original DUKE KAHANAMOKU authentic surfwear”. XL men’s size quite generously sized shirt, back between sleeve seams 22”. Tie-dye printed with batik hibiscus, indigo colors on white. Presume medium-weight cotton although that line of the tag is under a seam. Excellent condition. Looks best if it is ironed. I haven’t seen this label before an may amend the listing after more research.