Old uniform
A uniform from a former role — clothing that still fits and no longer belongs to the wearer's current life.
An old uniform in a dream is the dream's image of clothing that still fits and no longer belongs to the wearer's current life. The uniform marks a role; the role has changed. The dream brings the old uniform when something in your life — a former job, a former identity, a service that has ended — has left clothing behind that you can still wear and are no longer entitled to. An old uniform folded and stored with respect is the dream affirming the honest separation. An old uniform worn into public, as if the role were still yours, is the dream noting that the rank you no longer have is being borrowed against, and the borrowing is going to be noticed.