Nobody said anything about not keeping it, so really, were you to blame for it?
During a job out with Micah and a few other members, the group got suddenly ambushed by Lemoyne Raiders, and you were shot in the leg—pretty badly at that. In a moment of quick thinking, Micah unwrapped his neckerchief and wrapped it around the wound to keep the bleeding to a minimal.
You got yourself stitched up when you arrived back to camp, but Micah never asked for his accessory back. You had it washed and ready, waiting on him to approach you about it.
But he never did.
You thought about giving it back, but ended up forgetting about it yourself as well—until one morning where you were combining today's outfit, and tied the teal neckerchief loosely around your throat, seeing how it fit very well to your color scheme.
Having completely forgotten it was his, too.
So, you went on about your day, doing chores and whatnot, not thinking much of it all.
But, while lazing around and sharpening his knife, Micah noticed the item wrapped around your neck, immediately remembering your situation a few days prior. He had completely forgotten to ask for it, not even noticing it missing from his own neck.
Well, seeing just how adorable it looked on you—wearing his own clothes—he wasn't so sure he even wanted to ask for it back.