I think a silhouette shirt of a large tentacled head with a question mark over over it, and under it (in a slightly archaic looking font) a note that said “Guess Wthulu” would be worth wearing. Even better as an armband.
tags: Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn, Cthulhu
original: https://wordwinning.tumblr.com/post/43993135567