I think a lot of this is fairly subjective to be honest, and I can't see any of it genuinely affecting whether they give you an offer or not - other than looking scruffy.They're not going to reject on the basis that, as you're wearing a button shirt, you're scruffy or not smart enough, therefore wouldn't fit into the company culture. Not even subconsciously - yes, first impressions count, but each MC spends about 5-6hr at least assessing every candidate through tests, interviews and case studies!and about not wearing black suits - which some people have been mentioning previously - I went to a MC event the other day where a partner was wearing a black suit. Again, it won't really make a difference either way. As long as it's not brown, I'd say, and so doesn't especially stand out, they're not going to care. Again - first impressions count, but, at an interview, even a first round one, they spend as much as 2 hours interviewing and discussing your suitability. You can certainly guarantee that no-one's going to write in their notes:"excellent quantative analysis, sure grasp of what work we do, strong motivation for joining..,.black suit, no cufflinks, shirt pocket. REJECT"