Do you need to wear specific clothing at work?

Does your company have a specific set of clothes that you need to wear at work? Are these horrible or flattering?

I work for a company that take care of the local public transportation. We have different black pants and skirts we can wear. We also have a summer t-shirt, a vest, a warm sweater etc and a few other parts for the different pats of the year.
Do you need to wear specific clothing at work?
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