OK, start with a big ymmv, fwiw, etc. It' s not " scientific" , but I found this to be interesting. http://www.whitetail.com/camo1.html

Basically, the takeaway I got was that the " real-ness" or photolike image of the camo is meaninless, but the contrast/break up of the pattern is. The deer don' t see you as a bunch of oak leaves or tree branches, but will be more likely to see you if the pattern doesn' t effectively break up your silouette.

What is important is that you don' t want them to see a blob of solid color, which this guy says a lot of designer camo patterns end up looking like when viewed from a distance, especially with a light (sky) background. I use plain old army woodland and desert type stuff whenever possible, and blaze camo (blaze with simple blobs of black) and really think it works well.

The only reason I buy designer camo items is because the quality of the garments and availability is often better, but I try to choose patterns for their contrast/break up ability and don' t pay attention to the specific photo-real images or predominant colors.

But, I don' t have the guts to use an Hawaiian shirt! -zeke.