They requested this at a race I ran this year, exactly the same, had to be the orange polythene version. I think it was Long Tour of Bradwell but I could be mistaken...mind, there was no kit check whatsoever at that once I got there which baffled me a little. Conditions were great but 34 miles on fells and trails is a long way to send out a group of runners unassessed in my opinion.
It is possible to kit check everybody. Whether it is worthwhile is another matter altogether and dependent on the race. But Edale Skyline and Nine Edges are two off the top of my head where you'd have a bit of a job to actually get to the start without having your kit assessed. At Nine Edges in 2010 they had a registration table with kit check right next to it, and a couple of people circulating the throng of runners asking if they had been checked. And quite right too. I missed 2011 with injury :thunbdown: