Groundloop,
I would have thought most people turning up to an organisation like OAT will be doing their utmost to pelase and conform anyway. When I was there for a sponsorship briefing, the smiles and volume of laughter everytime the staff cracked a joke seemed pretty indicitive of that

.
Some people are just naturally messy, some a ridiculously tidy. I'm sure in most cases each individual is judged on merit with little regard to this, but there does seem a little too much in the way of hasty judgements about someone apparently based on a slightly less than formal presentation.
I think the example was turning up to their initial medical or CAA exams. I don't feel either of these require exceptional dress. Leave the Ali G bling bling at home by all means, but do the clean and tidy trainers, jeans and collared shirt really indicate a lack of professionalism?
As I said, I don't think dress standard (if accompanied by a polite persona) indicates anything at all. But if we are going to claim it does, then it is just as likely this willignness to conform could represent a very negative trait.