Summer children's sleeveless cotton vest undershirt boys base I shaped Sf1be000bd1fc49019dc49efd119ec1876.jpg Kids Organic Undies Woollykins Living Crafts Kids' Organic Wool Silk Short Underwear Shirt Little. Our children's underdress Ylvi is the little sister of our Under Dress Freya and together with our Children's Over Dress Ylva completes the outfit for inquisitive little adventurers. The untreated fabric made of pure cotton is not only comfortable to wear, but also robust enough to meet the special requirements of childlike adventurousness.