Have you been told anything by counsel, judge, or other person about your attire?
Normally, proper grooming and clean, conservative/traditional clothing that one may wear to a business job, religious services, or a graduation, etc. is appropriate, however, it is also important for people to be comfortable in the clothing they wear (looking uncomfortable may "communicate" a wrong message or heaven knows what). I have found a few sites which discuss this topic: here and here.
Keep in mind that an attorney can have an image or attitude he or she wants to convey or present at either a mediation or a trial which the way his or her clients dress may affect, so it is normally best to ask your attorney about that if there is any question.
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