Considering I don't even like to go out there with my PJ's on (which are actually just loungewear & not even real PJ's -- I did wear them out in public since they were my coming home from the hospital after having a baby pants. So, no one would even know it's my PJ's), not in a million years would I go check the mail that way (now if my house was burning down & I happened to be in the shower, I would consider going outside like that -- probably after attempting to grab a towel & clothes at least to take outside with me) but that's probably about the only way.
We live on a fairly busy street there is *always* a car passing by at some point.