I think I know whose shirt it is. And if it is who I think think it is. He likely doesn't know you took it haha.

Jo: Nope, not hording them. Just something to remind me of you when you're not with me. *gives another sweet smile*

I can just picture, one of the times they are [i]hanging out[/i] in Billie and Alex's room. And her walking out wearing Alex's shirt and just kinda waving at Billie as she passes. Haha.