I don't have any actual tweed and so used my Musto jacket with the tweed print. I appreciate that this will perform differently from real tweed but it is as close as I can come. It is also the case that there are so many different tweed patterns as to make any general test like this useful only in the broadest sense.
I included the MTP in some of the tests just because it has appeared in all of these tests so far and so it is there as a reference.
First a real colour image of all 4 jackets on a grass bank just to give an idea of the pattern - the solid brown jacket is a Harkila fleece and the solid green as a Simms fleece.
Now a test of the cammo properties on the same grass bank, basically the photo taken from a little further away. L - R Brown, tweed print, green, MTP
Then I hung the coats over a traffic cone in a forest ride. The background is mostly green moss. Firstly the control with MTP over the cone:
Then with the green fleece over the cone:
Then with the tweed print over the cone:
and finally the brown fleece over the cone: