The first thing to remember with an interview is that itâ€™s just that- and interview. Itâ€™s not an interrogation and I personally find it easiest to get through an interview by pretending to myself that I already have the job, and that helps you to relax and answer questions more calmly.
You didnt say what role you had applied for. A high street Electricals store they are going to be looking for someone who is capable of serving the public in a friendly and helpful manner, whilst looking smart and presentable. A combination of a smart skirt or trousers, with a smart shirt or jumper would look smart.
Usually in these types of interviews you will be expected to answer a range of questions about working in customer facing environments and assisting customers, as well as answering questions about any previous similar roles you have undertaken, so think in advance of examples you can give of good service given or how you have relatable experience. If you are applying for a technical role within the store they might ask you to demonstrate your skills.
Just remember to keep calm in the interview and listen to what you are being asked. Be honest, and if you are struggling, donâ€™t be afraid to ask for a few minutes to think. Be sure to have done some research on the company and have some questions of your own lined up to ask your interviewer, and remember, if you donâ€™t get the job donâ€™t see it as rejection- you wouldnâ€™t want a job that wasnâ€™t suited to you, so itâ€™s important to be honest.