A couple of years back I took a tour of Brenton Industries. They are the largest cover contractor to the US Govt.
Anyway, all woodland tops start off solid green. They put the new cover over a mocked-up bed, that has the camo pattern on it. Using a spray gun they apply a coating with IR reflective properties to the cover and blend it to match the bed. The coatings remain pliable long after it dries.
Brenton supplies tops and soft doors from HMMWV's to FMTV's and all sizes of trailers. They even build tents and shelters.