Usually, the joke is what nutty outfits the guys will wear one time they made the mistake of all dressing up like the Flash and showing their inability to grasp how normal people act.
For a party, Leonard decides to go as Albert Einstein, the perfect outfit for him.
You can even find some Melissa Rauch nudes scenes in that movie but according to the reports, she may have used body doubles for those parts in the movie.
You just need to be creative and potential is beyond your imaginations! If you look at this picture from her collarbone up, it tells another story.