What does the hotel security department wear?

That depends on what level the hotel is, how many people are equipped in the security department, and what kind of image you want to show. Under normal circumstances, such as express hotels and three-star and four-star hotels, they are basically security uniforms. It is best to wear a white shirt and tie in a senior four-star and five-star hotel. If you want customers to recognize them as security personnel, you just need to wear headphones.