Accessory for a safety belt buckle in a mobile vehicle

An accessory (10) for a safety device (12) for holding a person in a seat in a motor vehicle. The belt (14) which wraps around and holds the person's body in place is connected to an engagement part (16), which can be releasably coupled to a fastening part (18) fixed to the vehicle chassis. The accessory comprises an element (40) designed to at least partly cover the outer surface of the fixed fastening part (18), there also being means for connecting the covering body to the surface of the fastening part.