The officers (and crew?) on board the MCRN Donnager wear tight, spandex-like jumpsuits or BDUs.
Below the jump are reference images of these that I’ve collected from the web and some screencaps:
Again, most of these images have been retouched, to ‘correct’ the color balance and bring out details in the shadows. I cannot say for sure what any of the colors in the uniforms are. I can’t even be sure if they are black or navy blue. Exercise caution.