I've never had my group deal with them, but I base (In my head) Knight Errant's outfits off of the SWAT team of my home town. (Never mind that I still have no idea why my home town HAS a SWAT team in the first place. EOD makes far more sense! I grew up in a mining town, BTW, that's why.).
Black with silver accents, very militaristic, but without any helmets, and very limited on external markings other than rank and name. It gives a strong sense of authority without being overpowering or frightening to the populous. Standard patrol has reflective silver accents for high visibility, while other departments have dull silver that doesn't reflect well due to their more clandestine nature.
Detectives, of course, are plainclothes. A five-year old can still tell they're cops, but they're in suits nonetheless.
Also, I have Hard Corps, Knight Errant's fellow Ares-owned Security Competitor, wearing similar black outfits, but with red accents, and a lot more insignia designating training and (Declassified) operations.
As I now know the location of the supply store for Emergency Services (Police, Fire Department, Ambulance), and have an item on order there (Tanker Boots!), I'll probably get more ideas for things from what they have in stock as they also supply security companies.
