It is unacceptable to wear only underwear in public.
Jim needs to get an important letter in the mail and has just rolled out of bed to see the mailman approaching his mailbox.
Jim needs to hand the letter to the mailman.
Jim shouts out his fron tdoor for the mailman to wait, before throwing on a bathrobe and going to meet him with the letter.
Jim immediately rushes to the front door and runs out in his underwear to give the mailman the letter.
The mailman accepts Jim's letter with a smile and continues on his route.
The mailman is justifiably uncomfortable with the whole encounter and quickly walks away after receiving the letter.