I specifically said that my country doesn't usually depict him with an afro... Like I said, I can't tell you much about the tradition, because there isn't much to be found online. The one I know nowadays just a some people dressing up as chimneysweeps (as I said earlier), wearing blackface. The issue is when black Americans want to ban this one too, even in cases when it clearly isn't supposed to be a black person.
Also for the record, I find nothing racist about wearing an afro, white people wear them too lol. Even if somebody tried to dress up as an actual real black person, blackface included, I still wouldn't find it racist and would assume that a fan emulating some famous black figure. The actual racial undertones are usually very easy to spot. The Dutch Zwarte Pete being based on some Moor from Spain seems reasonably believable to me. What exactly would be racist about that?