Maybe they no longer wait for the comet, but there was a recent time when DIR was synonymous with the Halcyon brand and all DIR divers did indeed dress exactly alike.
Bleagh! I have taken four GUE classes, and at no time was I even ENCOURAGED to buy Halcyon gear, far less required to do it. In fact, very little has been made of my gear at all, except to discuss certain functional issues, and why the instructor thought what I had could be improved. EVERY class, including the one taught by someone who is a ScubaPro Rep and DUI rep, has been brand-agnostic.
I have dived with DIR divers in just about every brand of dry suit you can name, and in wetsuits, and in a variety of colors.
I'm sorry, but you are really showing that you have swallowed the internet hype, and know very little about the people or the classes you are disparaging.