Last weekend I had the honor of going to the Museum Store Association trade show in Phoenix, and while my New York colleagues were stuck in a torrential downpour all week, I was off enjoying a variety of museum display items in sunny, 95-degree Arizona. While all of the booths there were displaying some pretty incredible stuff (and I got a chance to go beat the Alliance gaming guys at the SET game), I was particularly excited to meet the reps from Legacy of Valor, who have licensed loads of Osprey artwork to be printed on t-shirts, long sleeve shirts and hoodies (or jumpers, as I think you call them in the UK).
I think Richard posted this link a while back (here it is!), but now that they have finalized the printing process, I highly recommend that any and all Osprey enthusiasts take a look at the Legacy of Valor site. And if you don't see the image you're looking for, get in touch with them and ask if they can make something happen for you!
And while you're there, be sure to check out the haversack and gas mask bag, both of which are historically accurate replicas right down to the fabric and hardware and include small pamphlets of Osprey work and art.