As the title states, what to wear under a lab coat? Especially if there's no specific dress code and most people around you are dressed casually? What kind of shirt, pants, shoes? Any suggestions? Edit: I'm an optometrist (OD) and I sometimes work in a mall (you know, like Pearl Vision for example...). Most of my assistants are women and are dressed business casually. These days, I usually wear a button down sport shirt and black slacks or sometimes beige pants with a leather belt and loafers. Occasionally I wear jeans and a sweater. In such a setting, what would you recommend? Should I start wearing dress shirts instead of sport shirts? I do want to dress more casually (jeans, boots) but at the same time, I don't want to appear unprofessional. Would jeans be ok under a lab coat?