Assemblies may form color guards, which are often the most visible arm of the Knights. They often attend important civic and church events.
The first Fourth Degree uniform, adopted in 1900, consisted of white ties, top hats, and tails. In 1940, the uniform was changed to a plumed chapeau, a tuxedo, a cape, and a ceremonial sword. With the 1940 uniform, the Supreme Master wore a dark blue cape and chapeau, a vice supreme master wore a light blue cape and chapeau, a master wore a gold cape and chapeau, a district marshal wore a green cape and chapeau, a faithful navigator wore a white cape and chapeau, an assembly commander wore a purple cape and chapeau, and color corps members wore red capes and white chapeaus.
In 2017, the uniform was modernized to consist of a blue blazer, an official Knights of Columbus tie, and a beret, all of which are embossed with the fourth-degree emblem. Members also wear a white shirt and dark gray slacks. The ceremonial sword was retained.