Funny what you remember about headwear, in my case it was a fellow OUT being loudly torn off a strip for wearing his cap in the Senior Gunroom at HMP Dartmouth rather than for not wearing a hat 'ashore'. Following the lecture on dress I expected a reprimand for wearing a suit which was clearly too light a shade of grey, it never happened, I was obviously too conservative in my rule breaking. How going everywhere in dark suits, shiny shoes and very short hair stopped the IRA realising we were in 'government service' I never knew.
As to today's standards - they'll be permitting officers to carry their purchases and males to wear black tie in mixed company next.