The clothing and makeup rituals help, of course, but there can be reminders buried in there that break from femme back to dysphoria. That seems to happen less often over time, fortunately. Once I'm all together I'm fine.
I feel the most feminine when I'm with other women, chatting, dining, or even simply sitting in an audience together (as at "The Vagina Monologues"

). The social aspects very much reinforce the medical stuff and gender presentation. What would we call this? Gender acceptance?
Being out in public and seen as a woman has a similar effect, particularly when I trigger affirmative responses, the checkout and smile from another woman, or the male chivalry responses (opening or holding a door, offering a seat on transit...).
As Alice1234 notes, being in androgynous wear like scrubs does nothing for us. I agree that underdressing can help, and whatever we can get away with in presentation, groomed nails, mascara and other eye goodies, can all help a little bit.