Amongst the Gods and Godesses, in the middle of Asgard, grows Yggdrasil, the tree of life. And at the base of the tree sits a little tourist shop that sells this t shirt. We sent a warrior to retrieve some so you wouldn't have to go there. Don't leave Midgard without this wearable map. Okay, so, less map, more awesome t shirt. But you get the point.
The most awesome t shirt in all the nine worlds. This beautiful celtic design of yggdrasil is sure to allow you passage into Asgard. Just tell them Odin sent for you. T shirts run a little snug, so for a loose fitting shirt, go a size up.