Thanks for the comments on my Painter's Block post, everyone. I decided to go with the semi-dress uniform, with the camouflage cloak. I think the result is pretty good, and the red doesn't clash too much with the camouflage.
One thing I've noticed in painting this guy up is that when I took photos of the model, various flaws in my paintjob that were not very apparent in looking at the model show up very well in the photographs! As a result I may have to go back and touch up his face a bit, as in the photos it looks very splotchy. There's also a few other flaws I noticed that may require some touchup. But as of now I think he's ready to lead his men into battle.
Taking a cue from Admiral Drax's self build, I decided to put some unit insignia on the otherwise drab left shoulder pad. In the middle is the regiment's heraldry--a black dragon symbol, while the numbers mean 1st Battalion, 5th Infantry.