Alicia Davis, 20, was working a day shift at her local Maine store on the night of her younger boyfriend's prom earlier this month and wouldn't have time to change before the dance started.So instead of switching into her fancy dress in the car, Alicia worked her shift in the long burgundy gown, adding sparkly jewelry and wearing her hair in an elegant updo.Old Navy store employees tend to adhere to a pretty casual dress code of jeans, roomy tanks, and stripes but this young woman went black-tie for a recent shift.