It's just so contrary to the fashion of the times that it has no reference point and immediately looks ridiculous to me. Oh, of course, I understand how this looks very cool in the right context, just like the elegant clothing of a 17th century monarch can look very cool, or how some classic Roman toga can be extremely fashionable...
But walking around like you live in a steampunk universe can only work at a convention where other people are doing it.
.... I knew this white gal who was a weeb and had a very gorgeous kimono, and once she put it on to wear it to meet some Japanese people downtown and... I mean, what a nice girl she was, but it ws just collectively embarrassing and attention drawing, so much so that the Japanese people actually finished dinner early and went off somewhere else without her... Yet, the kimono looked fine. It's just... overpoweringly decontextualized that it drowns out everything else, and then it has this element of "you don't belong in this."
Sure, a Pakistani man in traditional clothes does look out of place walking around the mall... But he is also a Pakistani, so while we immediately see him and think he must be some kind of traditional Muslim who is new to this place and outside our culture, he at least has the benefit of probably being exactly that...
But nobdoy can be like "Oh man I an ethnic steampunk and have just shown up from a nation on an alternative timeline where coal-powered industrial revolution never ceased..!"