Which of the following is NOT a part of knowing your customers?

Recognizing what customers wear is not typically considered a part of knowing them in the context of responsible beverage service and ensuring their safety. Understanding customers’ drinking patterns, tracking their time spent at the bar, and knowing their previous purchase history all directly relate to assessing how to serve them responsibly.

By understanding drinking patterns, servers can identify if a customer is approaching an unsafe level of intoxication. Tracking time spent at the bar can indicate whether a customer has been drinking for an extended period, which may also signal potential for intoxication. Knowing previous purchase history allows servers to anticipate customer preferences and monitor consumption rates.

On the other hand, while recognizing clothing may offer insight into a customer’s personality or socio-economic status, it does not assist in evaluating their drinking behavior or ensuring responsible service. Therefore, it's less relevant in the context of knowing your customers within the framework of responsible alcohol service.