What type of garments must licensees wear while performing services?

The correct choice emphasizes the importance of hygiene and professionalism in the esthetics field. Licensees are required to wear clean outer garments while performing services to maintain a sanitary environment for both the client and the practitioner. This requirement helps minimize the risk of contamination and ensures that the clothing does not transfer any bacteria or dirt to the client's skin.

Wearing clean outer garments also reflects a level of professionalism that is expected in the beauty and wellness industry. It reassures clients that the practitioner takes their health and cleanliness seriously. Professional attire can create a positive impression and enhance the overall experience for the client.

Other options, such as casual wear, any comfortable clothing, or designer labels, do not necessarily align with the standards of hygiene and professionalism that are critical in an esthetic setting. Casual or comfortable clothing might not always be clean or presentable, while designer labels do not inherently guarantee cleanliness or appropriateness for service provision. Thus, wearing clean outer garments is essential for providing a safe and professional service environment.