Hail to the King

Camilla: You, sir, should unmask.

Stranger: Indeed?

Cassilda: Indeed, it's time. We all have laid aside disguise but you.

Stranger: I wear no mask. 

Camilla: (Terrified, aside to Cassilda) No mask? No mask!

 - Robert W. Chambers, The King in Yellow

I have a deep and abiding fondness for those that dare to clothe themselves as the King in Yellow.  This take from KMK Designs is an absolute banger of a costume.  There's so much to like here.  The frayed and tattered robe, the embroidered glyphs, and that mask.  When you look at the closeup shot you realize the empty hood is actually a maw lined with dozens of human teeth.