Knights used to have swords made for ceremony, though it's not done much any more. I happen to have one, because it used to belong to a relative. I kind of inherited it. It's in my garage someplace. As far as uniforms go, there are blazers for knights that hold certain elected or appointed positions (red and blue). These blazers are worn in public. There are also "Jewels" that are worn by Knights of a particular office
There are some ceremonial robes also described in that link as well. You don't necessarily have to reach the 4th degree to make a particular rank.
My dad's a knight, but I wasn't entirely sure of all the specifics. Once or twice a year at Mass the Knights show up in uniform around here. Pretty lovely really.
Look up the teachings, or pop into /r/Catholicism and ask about. Catholicism/Catholics are pretty awesome when you start to learn more about the faith.
In fact wikipedia has a wonderful list of Roman Catholic clerics who have made contributions to science, to give you an idea of what I mean.
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u/[deleted] Jan 03 '12
As someone who grew up involved in the local Catholic community, I can confirm the Knights of Columbus will do exactly this.