According to dubai uniforms, Say something like:
1) Some of your attire choices are improper for the office while referring to either your dress code guideline or some visual examples.
2) Please consider wearing more conservatively and professionally for the workplace.
3) I think your appearance in the office might be a lot more professional.

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First of all, the clothing of your employees must comply with all safety rules. Today, there is a clear classification of protective equipment that allows you to quickly and efficiently select and purchase PPE and exactly the equipment that is necessary for a particular type of production or work. You can find everything you need here