Here's the thing. I've only had one instructor who wore something different from students and other BB (other than the stripes on his belt). He chose a black gi, which only he could wear. That isn't all that different from what you're talking about - he chose to wear what nobody else could - and there was nothing particularly flashy about it. He just liked black, and the association unifrom code was white.
Your posts are full of assumptions about people's skill based on their clothing and health. Some people are tacky, but still reasonable teachers. If the flashy acoutrements are a symptom of an attitude issue, it's the attude that's the issue, not the clothing. As for the health thing, people's health changes, and sometimes in ways they have little control over at the time (though sometimes it's because they didn't take proper care when they were young and dumb).
If I see someone dressed flashier than their school, it raises questions. But I hold judgment until I see how they teach. Girth has little impact on my initial judgment. I've been kicked in the head at close range (closer than I thought a kick could do that) by a guy who was significantly overweight - and apparently a lot faster than me.