I'm thinking leather trench coat, German Officers' cap, classic motorcyclist's goggles, leather belt with 2 MP40 pouches mounted on the back and a pair of cargo trousers with black boots.
http://airsoft.tiger111hk.com/product_info.php?currency=GBP&cPath=3_331&products_id=24247&osCsid=bcf498e0b667d950bd5a044c32778a83