There's something Asimovian about the British legal system.
A black toga[1] is traditionally worn in Dutch court cases by all the legal masters, but it does look rather stylish.
[1]: https://www.win-nieuws.nl/wp-content/uploads/2017/04/Student...
tl;dr it's argued that having a recognisable uniform, no matter how bizarre, levels the playing field and provides a sense of professionalism.
Still in England, think of queens guards. Those red bear hat uniforms make them seem like silly tourist attractions that you can tickle for a selfie, not professional soldiers that you shouldn't mess with. In that case, maybe that's OK. For barristers, that's not what you want.
There's a case for uniforms, but it's doesn't extend indefinitely.
For example from 1660 [0]:
> To my Lord’s by land, calling at several places about business, where I dined with my Lord and Lady; when he was very merry, and did talk very high how he would have a French cook, and a master of his horse, and his lady and child to wear black patches;
And [1]
> But my wife standing near her with two or three black patches on, and well dressed, did seem to me much handsomer than she.
I wonder why we don’t see more of this these days. Closest I can think of if Nelly with the band-aid.