Shroud of the Phantasm

The fabric of this cloak appears to be stitched with some manner of mystical pattern, but the pattern changes with the movement of the garment, confusing the eye into seeing what isn't there.

Students of Wael have quietly experimented with illusions, ever fascinated with theories that the world around them is a deception, a dream, or both. One year, an entire class of ambitious apprentices organized around the idea, forming a secretive coterie of existential skeptics. They donned cloaks like these to recognize one another outside of their covert meetings.

A dozen such cloaks were later found abandoned among a library's stacks of tomes. The fate of the bearers and their research is unknown, but the cloaks have circulated ever since as arcane curiosities.