Hi there
I agree that the DoD would not be best pleased if some punter was wearing stolen gear out and about.Naturally, they have to curtail theft wherever they come across it.One can purchase, legally, kit which is identical in every respect to that on issue.Curtiss' stuff is absolutely identical and, in some cases, is actual official issue.He makes it, sells it to the Army and you can buy it yourself if you like.It is quite possible to buy all of the Irish combat kit(pouches and webbing and so on) because it is standard across Europe, except for the little "FF" mark.As for aircrew kit, the standard NATO nomex overalls can be had for about £stg 85, from flight-supply shops anywhere in the UK.Incidentally, there has always been an undercurrent of nicked stuff in circulation, but it's pretty much been killed off by the plentiful legal sources of supply.
regards
GttC