Final answer:
A professional appearance is crucial for making a good impression in the workplace and involves dressing appropriately, maintaining good posture, and ensuring personal hygiene.
Step-by-step explanation:
The three essential aspects of a professional appearance include appropriate dress, good posture, and maintaining proper personal hygiene. To maintain a professional appearance, one should avoid flashy or revealing clothes, adhere to any necessary safety gear protocols, and ensure they follow the workplace's dress code policies. Initially, dressing formally is recommended until you better understand the company culture. Proper posture, such as sitting up straight, conveys confidence and a professional image. Moreover, personal hygiene is critical, from grooming to cleanliness, in delivering a professional demeanor.