Austrian officer's overcoat or "Oberrock" of the 1809 pattern. The one pictured is for infantry officers, but it can be made for any branch of service and unit in any colour combination.
Made of fine mixed grey cloth, with regimental facings, and lined with fine linen in the body and sleeves, pockets in the pleats at the back and one breast for the wallet, gilt or silvered buttons.
Only made to measure, as it was meant to fit rather tight over the coat worn underneath.