if you're interviewing, you need to show 100% respect and commitment to who you're interviewing with. it shows that you can assimilate. you need to put the organization's standards and interests above your own. you have opportunity to show who you are and what you can do in the Q&A, but if you come in wearing clothes that aren't a total conformity to corporate standards, then it shows you are going to potentially be a problem down the road, and aren't going to be an engaged employee.If you are wearing something equvilant or better than what you would normally be expected to wear, I don't see a problem with it.
in this case, that would DEFINITELY have been true. so even if the interviewer used aesthetics as 100% of their criteria, it would have been very effective in weeding out an undesirable.