Petit wore one of the body-armor bodices anyway, because while she trusted Jack and Bill to have a non-lethal security system, she didn't trust them not to have a funhouse-like one.
She was checking her own gear on the way down the stairs, making sure it was all secure, nodding as she unrolled their floorplan of the Pirates' house out across the coffee table, just looking it over, re-familiarizing herself with it.