Be yourself! Be genuine, look at what the people in store are wearing and remember you love helping customers and making people feel good about themselves!
Be yourself,have a love for your job,be presentable but casual not over dressed...be confident
Well behaved, dressed for the occasion, bring with you the important documents that they might need to review what you have done in the past, be able to communicate with them properly and not mumble, making it hard for them to understand you because then already they know that you may not be able to talk to customers correctly.
Help job seekers learn about the company by being objective and to the point.
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