I encourage everyone to start looking on the internet for militarily shows such as this one:
http://www.torontomilitaryshow.com/
You never know what you will pick up at these shows. Several years ago I picked up an original bdu for ~$40 that fit like a glove.
Also don't feel as though this is a allied special forces only event. A chap with a panzerfaust might have disabled your tank and killed the rest of the crew leaving you with nothing but your Thompson to wander the countryside after bailing out. Perhaps your dispatcher's motorcycle crapped out leaving your Sten as your only companion.
My point is to be creative, and do some research. You might be surprised what peaks interest with a little reading.