Art on t-shirt is from painting that Þrándur Þórarinsson made for cover of Reykjavík Grapevine Issue 02 February 2015. Cover story was interview with Björk that you read here.
You can also buy poster of the cover here
About fabric and sizes:
This t-shirt is everything you've dreamed of and more. It feels soft and lightweight, with the right amount of stretch. It's comfortable and flattering for both men and women.
• 100% combed and ring-spun cotton (Heather colors contain polyester)
• Ash color is 99% combed and ring-spun cotton, 1% polyester
• Heather colors are 52% combed and ring-spun cotton, 48% polyester
• Athletic and Black Heather are 90% combed and ring-spun cotton, 10% polyester
• Heather Prism colors are 99% combed and ring-spun cotton, 1% polyester
• Fabric weight: 4.2 oz (142 g/m2)
• Pre-shrunk fabric
• Shoulder-to-shoulder taping
|Width (inches)||16 ½||18||20||22||24||26||28||30|