If I were interviewing you here is what I would expect. Your hair up and neat. A dress, pants and neat blouse or skirt and neat blouse. In other words, put out a professional appearance. Hair down and I would wonder if you would wear it to work. A shirt or pants, that are not clean and pressed, same with the blouse, how would you dress for work.
I once fired an employee, after warning him twice, for failure to dress in something other then jeans with holes in them. a T-shirt and flip floaps. Why? Because he met daily with clients, their employers, physicians, potential employers. I got several complaints from adjusters, who had gotten complaints from the fore mentioned parties. He did not dress as a professional and he did not look like a professional.