It's wrong to keep things that are not your's.
Toby had a study session with Neal and Neal left his only jacket at Toby's place.
Toby wants to decide what to do with the jacket.
Toby decides to give the jacket back to Neal.
Toby decides to keep the jacket and not give it back to Neal.
Neal will have his jacket and not have to get a new one.
Neal will have to buy a new jacket.