Some good points thus far by CV32, AJ, B-78, skypilot et all.
As stated, the key is to break up your outline not only with your chosen pattern, but your surroundings. Once you understand how a Coyote sees in the Grey/Black & White spectrum, it certainly helps in choosing a certain pattern of Camo to suit your area & needs.
I've done alot of research taking various patterns from online swatches and running them through a few photo editing programs to switch to a Grey/Black & White Scale, but also photographing some those various patterns in actual scenarios (both Colour & B&W) to see how they show up in a Coyotes eyes per say. The results have been interesting to say the least.
You'd be suprised how some of the more common patterns/brands avail at retailers actually stick out like a sore thumb in hunting scenarios, even with natural cover being used. An all White or even a Snow pattern like Real-Tree AP Snow/Mossy Oak Snow can look out of place in an open field of snow, making you like an un-natural/out-of-place blob, thus raising a Coyotes wariness to your location if "something doesn't seem right" to them. By the same token, even some of the higher end Brands (ie; Sitka, Kuiu, Core4Light or First Light) aren't suitable, while some of these actually work well. This is largely based on that alot of these latter brands and their patterns are Western/Mountain based, not really conducive to the open prairies or tree-lined farm fields of Ont for example.
Then there's also the whole micro/macro (Sitka/Kuiu) vs an actual pattern (Realtree/Mossy Oak) argument to add into the fray, but that's a whole 'nother thread (easily).
Camo is like any other piece of gear we carry afield. If you have confidence in it, it will help & work for you. If you doubt or second guess your choice, chances are it will be the first thing you blame for failure.
