Be neat & modest & clean, well presented black long pants & white business shirt.
Although Priceline is a chemist, for any job i believe it is very important to look as profesional as possible. This means wearinga dress or skirt that goes past the knees, with a conservative dress shirt. Low heel to flat shoes is acceptable with your hair tied back in a bun. Whilst a blazer is not necessary, it would be highly encouraged.