Columbia University: College of Physicians and Surgeons

• Students are expected to be clean, well groomed, and dressed in a manner appropriate to their responsibilities
• In environments that include contact with patients, the following are NOT appropriate for the workplace: jeans, overalls, sweat shirts, sweat pants, shorts, leggings, halter or tank tops, non-collared tee shirts, work out clothes, sandals or open-toe shoes, caps, bandanas, baseball hats, or body or facial piercings other than ears and those required by a student's religious or cultural beliefs
• Recommended acceptable attire includes: collared shirts, ties, slacks, skirts, blouses, sweaters, and dresses; sneakers are also acceptable if clean and presentable
• Students must wear a short white coat with their name badge and university identification visible at all times when seeing patients
• Students must maintain a professional appearance even when they are not seeing patients
• Students must maintain an optimum level of personal hygiene
• Only blue scrubs may be worn in the OR; students must also wear a white coat if wearing blue scrubs in any other part of the medical center
• Blue scrubs may not be worn outside the proximity of the medical center including in transit to and from the medical center
• Scrubs of any color other than blue may be worn for anatomy lab

Source: http://ps.columbia.edu/education/node/1940