Breakdown of El abrigo de lana está limpio, pero prefiero llevarlo a la tintorería.
Questions & Answers about El abrigo de lana está limpio, pero prefiero llevarlo a la tintorería.
Because limpio here describes a current condition of the coat, not one of its essential characteristics.
So El abrigo está limpio means The coat is clean (right now).
If you said es limpio, it would sound more like it is clean by nature or it is a clean kind of item/person, which does not fit well here.