Corrected entry: When Patience is walking home from the Hedare mansion, she is carrying her only costume in a bag. She gets arrested when entering her apartment. When she escapes prison, she's wearing the costume. They would have held it as evidence. At the very least, the police would still have it with whatever things she had on her when she was arrested.
Bulldozer
19th Oct 2004
Correction: She doesn't have the bag when she enters her appartment, thus it wouldn't have been taken by the cop when she was arrested. It's possible that she hid it before enterting the apartment, and thus was able to retrieve it later after she escaped.