What kind of forest?
Hardwood forests or mixed hardwood-softwood forests only look like a sea of green from the outside. Once you cross through the brush at the fringes and enter the treeline the predominant colors are grey bark, dark shadows, and the dull rust brown of centuries of rotting dead leaves underfoot.
There's a reason M81 Woodland is mostly brown, khaki, and black, and less than half green.
DPM is also excellent in North American hardwood and mixed forest. Back in the day, before the advent of all these gucci camo patterns, a lot of people felt DPM was decisively superior to US M81 Woodland for North American hardwood forests, because the shapes were smaller and seemed to them to do a better job of breaking up the human shape closer in than Woodland, and because the tan/khaki color was lighter and provided more contrast and the green was a more faded, lighter shade that was a better match for common foliage--though it's also true that DPM was made for five decades on several continents, with very different dyes and printed on very different equipment, and not all "DPM" looked exactly like British milspec.
Multicam is fairly good in late autumn. Otherwise, at least for the forest environment, it's too pale and too brown. Also, just from looking at it I get the impression that the patterns are too small and there's not enough contrast, and that from about 50m it's going to "blob out" and look like neutral "coyote brown." It could be worse. Supposedly the Germans are making a sort-of-copy that they're calling "Operationtarn," which is Multicam without the soft blurred-edge transitions, intended to break up the human outline from further away. It's also probably a lot less expensive to print it that way.
ATACS-FG is excellent in both hardwood and softwood forest--in spring and summer. In hardwood forest in autumn it's WAY too green, which is probably what ATACS-AU is for.
Flecktarn, like Danish M84, is outstanding in thick green pine forests. Anywhere else, it's anywhere from a little too green to much, much too green.
The Marines are very enthusiastic about MARPAT. MARPAT is, like M81 Woodland, mostly brown and black. I personally wonder if the finely detailed pattern and tiny pattern elements are likely to cause it to "blob out" into a dull brown blob past fifty meters or so. M81 was designed to be disruptive--to break up the distinctive human outline--and remain disruptive out to 200m and beyond without "blobbing out."
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