A black Northface raincoat with a black embossed logo on the upper left chest area and a pair of Beats Solo Pro headphones were taken from a Hyundai Elantra.
It happened sometime between 11:30 on 19 June and 08:00 the following morning, while the vehicle was parked on Monument Road, St Peter Port.
Anyone with information regarding this incident is asked to contact PC 74 Sheppard on 222 222.
Alternatively, witnesses can contact Crimestoppers anonymously on 0800 555 111.