Stealth cloak

The stealth cloak seems to be a fairly common piece of surreptitious equipment, as Castle Heterodyne was able to identify Tarvek Sturmvoraus and Violetta wearing them as they. However, when we do get to in question, they are wearing (respectively) a sheet and a Smoke Knight uniform, with decided lack of cloakage.

Considering the generally stealthy nature of the Smoke Knights, one might extrapolate that stealth cloaks are part of their standard equipment, although not technology proprietary to their use.