I've always considered effective camouflage/concealment essential for UK air rifle shooters. The most common type of quarry you are likely to take will be a variety of birds. Birds are really Avian Dinosaurs (dinosaurs didn't die out) and have excellent eyesight and Mort is right about being spotted. I have shot a lot of Crows and I have the greatest respect for their ability to spot the smallest "giveaway", anyone who shoots knows how wary Crows are. I would seriously recommend a full face veil and gloves like Mort said Scythe, then get your Rifle covered. If you really want the best camouflage then you should convert your DPM jacket/smock, and pants into a "Ghillie suit" using the natural vegetation of your area as a supplement. There are lots of helpful articles on the web how to do this. You could also buy one, but it will never be as good as one you make yourself using local materials. The best manufactured "Ghillie suit" I have seen was called "The chameleon" although you would need to "tweak" the colour blend again to meet local conditions. Making your own can be time consuming, but that shouldn't matter to you as the more effort you put into your suit the better it will be. Ghillie suits can be a bit of a "geeky" subject and scoffed at by a few shooters who are quite happy to use DPM all their lives, and the results they get using it. If there is a down side to using a Ghillie suit it is in the added weight, and they can be hot in Summer months. They are completely useless if you are moving around, people who think you can walk around in one and still be concealed are wrong(mainly paintballers) they don't work like this. Ghillie suits were invented by Scottish gamekeepers to catch poachers, and only work if you remain motionless. Another advantage is that you can change the background colour with the seasons. For close range Air rifle shooting they give you the highest level of concealment possible.
http://www.ukmcpro.co.uk/field-kit/camo-...etail.html