just to add to general discussion...when I started in judo in late 60's, there were only four colors of belt: white, green, brown and black. Each colored belt rank had several degrees, but there were no distinguishing marks to signify, say, green 1st or green 2nd. Higher dan ranks - maybe 5th and over? Don't recall now - could wear a red and white belt, but I seem to remember that most of the senior belts considered actually wearing a belt other than black was showing off and very un-Japanese. Modesty dictated that even a high ranking dan wear a black belt under most circumstances.
JKA shotokan has something similar, in that both dan and colored belt holders have no visible indication of degree. Dan belts are very often embroidered, in Kanji, organization on one side and either the student's name, or the instructor's name on the other. There are no dan numbers, rank stripes, etc. So that guy in the shiny new black belt may be a very high rank wearing a recent gift from his students, for instance. If any shotokan dan practitioner wears anything but a black belt, I am unaware of it.
I now train in a Korean school, where all belts have stripes (usually common white tape) to indicate degree of colored or dan rank. Dan belts are embroidered in English with student's name and dan number, and the organization in Hangul on the other side. Some dan students have the rank stripes embroidered in gold on the ends of the belt. Starting at 4th dan, studio owners can be promoted to a red and black striped belt. Higher degrees get some variation in the mix of red and black.
Just a different mindset I guess. The shotokan schools (in the U S) tend to very plain white uniforms with a minimum of adornment - maybe a chest patch. The Korean schools tend to a plethora of rank and specialty patches, usually in English, plus flags, organization patches, school insignia and the like.
just an aside, we have seen some shotokan schools from Central and South America that wear uniforms bearing the name and logo of corporate sponsors on the back, much like a Little League uniform.
Personally, i like the unadorned look, plus a simple belt with no numbers, rank stripes, or other indicia of rank or seniority, etc. But I think the karate works or not, no matter what the uniform.