Outbriefs are usually only found at schools that are involved with RAF cfs contracts.
They are fairly formal as you would expect. Also the fixation with clothing is also required.
Most schools do have a form of out brief its just not as formal as the RAF formal brief.
As for clothing yep its a good idea but not really something to get wound up about if you see others not following good practise.
In fact most commercial pilot uniforms are an out right fire hazard they would just melt into your skin.