Tony, you did a great job on this one and I really don't know why you felt confused re Tartan
again you executed it very well!
I'm posting a section of my "explanation" re what/how I tackled the Tartan again for the benefit of all
[After I painted a field of dark blue comprised of Navy Blue (Maimeri) + Black, I laid in the green bands (Nap Green Andrea). After that, I mixed the dark blue + green to obtain the blue green effect of the other squares, as can be seen in the first update of the other thread. Next, black green bordering was painted in. Green ochre (V) + a drop of Tamiya matt acrylic (sorry guys but am at work and don'thave the bottle with me) was used for the "yellow" stripes. Red ochre (Maimeri) was used for the red grid
Next came the "weaving" which I achieved by 45degree strokes to the left (I made sure that I kept the strokes to the left, that is upper stroke starting from the left side and end downwards on the right....hope my English is explaing well enough to understand ) with the corresponding underlying colour, on both the yellow and red stripes. Next came the pronounced weave where the lines intersect as this will be a pure/pronounced/enhanced colour, with yellow ochre and red ochre.
Final step was a diluted overall wash with Blue black W&N Oil + white spirit to unify the whole pattern and sort of harmonize the picture. Ivory Black W&N Oil, again diluted was applied inside the pleats after this dried I revisited the intersections with red ochre and yellow ochre accordingly.]
Ray