As much as I have to agree with Geezer that there are people who would never dream of wearing a collared shirt on weekends, it is just odd to them to wear one to look good or for pleasure's sake. However, I find it impossible to believe that MZ does not know that as a general rule, you wear a suit (or at least a sport coat) to a business meeting. When going for an interview, every kid I know out of college knows that they should in fact wear a suit. I might be a solid black polyester suit that is a size too big or shoes that would be better suited for a trip to the dog park, but it is still a suit. I don't think he can claim he just didn't think of it, I find it more likely he thinks he is MZ and he can do what he likes at this point. That said, he may not have meant any offense to the investors he was meeting, not everyone holds true the "You get dressed up to show your company they are important" idea.