A break in Astartes armor was bad, and you as a serf were meant to help upkeep this armor. But in this situation you couldn't fix it. So you had to improvise, removing some of your cloth you hastily tied it around the break. A hold for now.

Now on your way back to the ship, a lack of clothing, embarrassed, but it kept your Astartes alive. The Astartes could feel your uncomfortableness with the lack of covering, he wrapped his cape over you. Keeping you covered.