Which of the following is acceptable attire for licensees while performing their duties?

Smocks are considered acceptable attire for licensees while performing their duties because they maintain a professional appearance and provide a hygienic barrier while working. In the esthetics field, where client interaction and hygiene are paramount, wearing a smock allows for easy movement and protects both the licensee's clothing and the client's workspace from any potential contamination.

Professional attire is essential in establishing trust and comfort between the licensee and clients. Smocks typically cover most of the body, ensuring that the licensee presents a neat and organized image, which is important in a service-oriented industry.

In contrast, other options like lingerie, see-through clothing, and gym shorts do not align with the professionalism expected in an esthetics practice. Such attire could be deemed inappropriate for a work environment, as it does not reflect the standards of hygiene, professionalism, and respect for the client that are crucial in this field.