I would say you should be yourself in therapy.... So I would think clothing choices would reflect you. That being said as people mature or start working in careers that are more conservative such as certain business jobs...or are high school teachers (lol)it is not uncommon for them to wear more conservative clothes for those occasions and perhaps dress slightly more casually for personal time...

If I noticed the T staring at my chest then that would be a signal to me....otherwise do what feels right to you