Elegant Skellige shirt is a light armor in The Witcher 3: Wild Hunt, which can be found in Yennefer's room at The New Port inn at Kaer Trolde Harbor. It is also sold by Elihal, Sjusta and the Kaer Trolde citadel armorer.
Yennefer recommends Geralt to wear it when they both attend a banquet honoring King Bran's death. She also recommends he wear Skellige breeches and Skellige festive slippers.