I walk straight from therapy to work, so I wear work clothes - that is to say jeans, and a shirt/T-shirt/sweater depending on the weather. In fact, I pretty much always wear jeans, or sometimes on very hot days some kind of thinner long trousers. On days when I teach (I work at a university as a senior lecturer) I might not choose an overly weird T-shirt. However, when I have no teaching that day I sometimes pick a statement T-shirt appropriate for therapy, such as "Mad, bad, and dangerous to know" if that's how I feel on that day. I am fortunate enough never to have worked at a workplace that had any kind of dress code, since I have no dress sense or interest in clothing (except for interesting T-shirts, I must admit.)