I've seen Ezzenglade and Ghost Diesel sporting these sexy hued baddies around the realm, and am wondering where i myself may acquire such a treat. (besides buying)
Bone knights drop the mask as a rare. Tailors obtain clothing bless deeds as a reward through the BOD system. Tailors obtain the mask dye as a reward through the BOD system. Combine all 3 and you can be just as pimp.
Rare drop on skeletal knights. The hue comes from mask dyes. The bless comes from CBDs. The badassery is innate.
Also you can find the bone masks (and every other mask) as a rare in level 4 dungeon chests. If you make a lockpicker, the process of going from 95.0 to 100.0 lockpicking on level 4 chests will net you 3 to 5 of each mask type.
Best way to get rich without realizing it. Just crank away, every 20-30 minutes during your play time, and when you're done you'll have half a mil in the bank, every mask you'll ever need, and a few nice magic weapons too.