Thanks StarChaser and Tamer for the ideas, I think you're right about the cape, and secondary colors. Tamer, yes a good weathering is in order.
I'm pretty much finished this Kashyyyk Swamptrooper AT-RT driver. I made a webbing out of
folded aluminum foil, then glued on a holster and pouches. I weathered him using paint thinner and alternating green and white washes to give the painted armor a worn look. I'm using the Jyn Erso gun, to me it is practical for an AT-RT driver to have a sidearm while mounted, and a rifle when dismounted.