I'll give you the advise my therapist gave me, go in what ever you feel most comfortable in. I went to my first therapy session in male, and have been in a dress to all the others since that first one. I went to my first Endocrinologist consultation in female mode. I wore my cute polka-dot dress, black cardi, nude hose, and black flats. I also put on my bright red lip color. I'm really feeling comfortable in my dresses, and wish I wore them more often as I'm not full time yet. What ever you do, be comfortable.
Hugs,
-Alana