Waiting for my very first ELC RAF Irvin to arrive; purchased as a previously owned jacket. The jacket is suppose to be in "excellent" condition but, who knows. Talking with the seller I know he's not familiar with this type of jacket and hasn't cared for it like it probably should have been. The jacket could be around 5-10 years old. Is there any basic things that I need to do right away as far as cleaning/conditioning/hydrating? Any guidance you could provide would be greatly appreciated. Thanks