Graniph is a Japanese clothing brand that sells T-shirts and hoodies in fun and vibrant designs. With stores in Australia, Taiwan and throughout Japan, they also feature collaborations with various designers from around the world. Some recent artists include Herb Lubalin, Atsuhiko Misawa, and of course, Moomin!
I own several Moomin x Graniph tees and my only suggestion would be to use a softer cotton for the tees (but not the tissue thin stuff). That said, the current tees are great and have minimal shrinkage. And I absolutely love my recent purchase: a longer length hoodie with buttons to keep your hood in place on those windy and rainy winter days–a nice modern twist on the traditional hooded jumper.