She found the jacket in a coffee shop. She felt bad for taking it, but it was a cold night and she had no decent clothing.
As she slipped the jacket on, she found herself knowing all kinds of new things. She could pick a lock. She became amazing at rhythmically clicking her fingers. That all came to an end when the owner of the jacket saw her and demanded it back.
“Why would you even have a jacket like that?” she asked as she returned it.
“Gotta impress girls somehow,” the owner replied, before exiting the shop and disappearing.