Personally, I dont get why your dad did it in front of you. It very well could have been stress. I am a 51 year old male, and I have my own "collection" of womens underwear and socks. I enjoy the colors, styles and fabrics. If you saw me in person you would never suspect that I am any less of a "man".

Now the reason I say that I agree with the stress theory is because if I am stressed, that is when I get the strongest desire to "crossdress". Ive never done it outside though and am mortified at the thought of it. I can agree with what someone else here says about it possibly being a childhood issue. I can vaguely trace mine to certain events of my childhood but not directly to my parents.

either way what you father needs is your help and support, not for the crossdressing, but for the amount of stress that made him go out and show off. As far as the cross dressing is concerned, what is really the harm in wearing a certain fabric of a certain color and certain cut?!?!