Choosing what to wear for an interview can be very stressful most times. We can help each other on this thread and make it easy for everybody who are going to take the interview with Tesco.
For all interviews it is important to look smart. I would always choose dark colours and a suit. I would make sure everything was clean, newish looking and neatly ironed. As appearance is important in customer facing roles, I would also make sure my hair and make up looked good. I would probably tie back my hair, as it is long, put on a bit of mascara and a natural coloured lipstick.