Sure, here's a potential plot for a new Seinfeld episode:
Title: The Stolen Jacket
Jerry, Elaine, George, and Kramer go out to a bar after a long day of work. Jerry is wearing a new jacket that he's proud of, but when they leave the bar, he realizes it's missing.
The group retraces their steps and asks around for the jacket, but nobody seems to have seen it. Meanwhile, George thinks he saw his ex-girlfriend with another man at the bar and becomes obsessed with figuring out who he is.
As the night goes on, they start to suspect that someone in the bar stole Jerry's jacket. Kramer gets the bright idea to set up a trap for the thief by leaving a decoy jacket on a nearby bench.
In the end, they catch the thief but realize that they actually took the wrong jacket - it belonged to a different person from the bar who is now furious at them. In the midst of all the chaos, George realizes that he was mistaken and the man with his ex-girlfriend was actually her brother.
The episode concludes with the group trying to make amends with the angry jacket owner while Jerry laments the loss of his beloved jacket.