Somebody has already stated that being still is probably the best camouflage effect we can employ no matter what pattern or color fabric we wear. My son, who is a trained artist, told ne once that lighter shades, particularly of tan and grey, against a woods background tend to create the illusion of empty space, which sort of explains how a deer just disappears when he stands very still. Tan and brown, however, bother me as hunting colors from a safety standpoint.
I usually wear camo or plaid but have had success wearing solids. I do not use blue, mainly because I don't wear blue jeans at all.