I wouldn't go for the nautical look, I would rather go for emphasizes militarism, that being sleek and stealth like. For inspiration, I always fall back to the Cats & Rats cover of the two brush cut individuals or the Reformation Coalition's "black suit" (they couldn't have come with that look all their own and manufacture in in such quantities and given that the Imperium was also their Bete Noir...I always figured that they emerged from the Solomani remainants).