Hello Dan, My feeling is that your wearing a skirt, if not a dress, can only improve your therapy session. Go as far as you are comfortable going with showing your true self.
In the first place, it is relevant because it’s an expression of the genuine Lt. Dan. That alone should help your therapy. I usually go to my therapy in a dress.
Secondly, the first time I went in a dress I called ahead to give him a heads-up. Neither the heads-up nor the dress made any difference to my therapist.
But wearing a dress allowed me to stop hedging about the subject and just in general be more comfortable and open. Both of which are important in any relationship, but a therapeutic one in particular.
My heads-up probably made a difference to his assistant. It was the first time I met her face-to-face. Since then, I've always suspected she purposely or subconsciously stuck around that day so she could see what I looked like in a dress, which of course is fine with me. Though I don't remember a compliment from her! How rude!
In short, you and your therapist have everything to gain and nothing to lose by your going to your next session skirted and, as I noted above, to the most advanced version you feel comfortable sharing.
Good luck with your therapy! Stay with it, it works. Meds and willpower are not enough to manage afflictions like PTSD. You need expert guidance from a trained professional with whom you have a strong, supportive, open relationship.
And by the way, if after your next session you don't feel you have that with your current therapist, ask for somebody else. The VA has lots of shrinks; you have earned the best one for YOU.
If there is any other way I can help you with this, please let me know. As I understand it, PTSD is usually triggered by some specific incident. When you are ready to tell me what brought it on, I will be interested in hearing about it. The more I know about it, the more of your load I can shoulder.