Uniform Stealing Board

Chinese film, alternately titled "My Girlfriend is a Duplicate." As the name indicates, it's about a woman who has been cloned, with several doubles of her kept in a secret lab. At one point, while trapped in the lab, she is accosted by one of the clones, who restrains her and steals her shirt to impersonate her.

Starts at 45:45.

https://www.youtube.com/watch?v=10_OQKFtb0E