Dressing professionally at work/internship/volunteer etc. is very important.
The policy at most locations is “business casual” Monday through Thursday and “casual” on Friday. This policy is designed to maintain a professional work environment that may include scheduled or unannounced interactions with clients, board members, donors, vendors and the community at-large. Clothing normally worn while lounging at home, to the beach or a park, or to clubs and bars is not considered appropriate on any work day.