Wow. The designs so far are amazing. I thought I'd throw mine up and see if it might help.
I'd go with a two piece flight suit. Dark blue pants and a black shirt, with a dark blue vest. After all, even though it's Marine based, we still want to know it's a Mando, and too much black just kinda makes everything run together.
Highly shined black armor with red trim. Red shoulder bells with gold rank chevrons and gold trim.
Gold button attatchment points, and buttons down the center diamond and loincloth.
Short cape, kama, and loincloth to evoke the feeling of the tunic length jacket, all black with red trim.
Blue gauntlets, to set them apart from the sleeves, with white gloves.
Black highly shined boots.
I put up two pics. First one is the original .bmp, so you can see the real colors, because the .jpg file tends to dull it down and it looses some definition.