I think, at least in the cover, that the whole suit is dark green (very dark, almost black; and I don't know, but I feel like velvet fabric would be fitting here), with the vest in a lighter shade. The contrast with the red (complementary) and the yellow accents (analog to the green) is a nice palette.
And also, a nod to the Robin colour scheme.
But we will see for sure once #33 is out \o/.
Nice set of pictures btw. Loving them.