I have to say that my dressing is almost entirely "pleasure based"... in the first few years of dressing, I went for the stripper clothes/ trashy lingerie/ platform PVC boots, which was a great turn on for me. Somewhere along the way though, a spark of rationality ignited inside me, and I thought "this style of wear is not really how I would be seen in public." I turned a corner then, got rid of the racy stuff, and have since boughten and worn only stuff a true GG would wear.
But the arousal is still there from it. I get the urge to dress, go out into the world, just be me, you know? I would love to just go about my normal day dressed and not think anything of it. I would, except for one thing: as soon as I "get off", the urge completely disappears. Like that side of me retreats into it's cave to regenerate, and my full male side takes over. But within an hour or so, the urge is completely back in charge, and I want to dress again, but by that time I am out and about or not in a way where I can dress!
So yeah, it's mainly an arousal thing, but most of the time I try to ignore it and wear what i want, because I know as soon as I go off, it's over