The leather jacket was a jacket made of black leather. It was what DI Sam Tyler commonly wore during his time in 1973. It appeared to be slightly battered, and was commonly worn with boots, jeans or plain trousers, a St. Christopher's pendant and a variety of shirts. Sam was frequently seen wearing it during Life on Mars.
After Sam apparently died in a car accident (in truth passing on to the pub from Gene Hunt's world), his jacket was kept in storage in Manchester. During her investigation into Sam's death in 1983, Alex Drake had the jacket brought to her from Manchester. However, Gene Hunt discovered the jacket, and burnt it along with Sam's files, telling Alex that it was 'a dead man's jacket, nothing more.'