Dress Code for Hospital Staff: Professional Image
If you can get past the "purity" mention, this article is an example of how an organization is specific about a dress code that communicates professionalism. Individuality is fine, as expressed by the variety of scrubs and currently available and worn by medical personnel. Yet, a unified "organizational look" sometimes communicates that individuals are professionals within that organization.
Much as we like expressions of ourselves as individuals, the military branches, law enforcement and medical personnel, and others demonstrate that uniforms convey "I'm a professional" better than individual expressions. This medical institution has gone back to the future with its medical staff.