I think good grooming is just a habit you get into. At all of my schools, from infants to leaving, uniform was not any sort of option and there were no variations. Regulation skirt, blouse, tie, cardigan, socks, shoes, gabardine mack, leather satchel etc. In working life I've always been office bound, which meant suits. When I worked at the Chamber of Commerce women were not even allowed to wear trousers! though that was a few years ago. It starts with school, and depending on how the rules are enforced, it stays with you. Its the schools you see, too bloody soft by half. Uniform should mean uniform and bloody half measures. No trainers should mean no trainers.
I didnt come from a well off family (Green Lane, Small Heath, for those in the know) but you obeyed the rules.
Are there any rules these days?