One "schoolboy error" that re-enactors in military uniform often seem to make and I noticed this with a chap last year when he arrived at an event before he had even got out of his car is to forget to get their hair cut. It seems such an obvious mistake to make arriving at an event, dressed in vintage military uniform but having a hair style that would be unacceptably long for military service. It is an easy thing to correct, nothing to learn, just go into town and visit the barbers; why do so many re-enactors fail to do so???