You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
alternatehistory.com
In the medieval era, the Teutonic Knights wore white tunics with black crosses and otherwise the usual knightly garments, though with their spectacular helmets, like this:
Had they survived through to the modern day as a military-religious order, what would their uniform look like in the 16, 17, 18, 19 and 20th centuries?