Our LDS doesn’t dictate a scuba uniform, but, of course, the instructors and DM’s can only wear what brands they sell in the shop. My normal loadout is a BP/W with 7 foot hoses, octo neck bungee, etc. So, I just use a set of rental gear when I’m DM’ing confined water classes. During the checkout dives, I do wear my normal setup so the students can see a variety of options.