[Looking over all the items, she decided not to go for the items that she had seen him wear constantly that were personal. It was never good to play around with magic with items you care about.]

The ribbon is probably the best bet, honestly. You can wear it without people thinking it's out of place and if we damage it while doing the experiments, you can just get a new one. The rest of it might stand out too much and be picked easily as your item by someone else. Best next option is the pen. What do you think?