One of the hardest aspects of being a foster parent is being part of a team of professionals that perhaps doesn't consider us, as foster parents, real members of the team. So, consider all aspects of your presentation - and that includes dress. Here are some other thoughts.
Some communication problems between foster parents and social workers occur due to what may seem like a lack of respect and perhaps unmet expectations when each assumes what the roles of the other are within the foster care system. To best avoid these communication problems it is important to establish roles and expectations early on in the relationship.