In accordance with various embodiments, methods, systems, and vehicles are provided. In various embodiments, the vehicle includes a body; one or more occupant seats disposed within the body for an occupant of the vehicle; and, for each occupant seat, a restraint device, one or more sensible elements, and one or more sensors. The restraint device is configured to provide restraint for the occupant when the restraint device is properly worn by the occupant. The one or more sensors are disposed within the occupant seat. The one or more sensible elements are disposed as part of the restraint device. The one or more sensors are disposed within the occupant seat, and are configured to sense the one or more sensible elements when the one or more sensible elements are in proximity to the one or more sensors, as an indication that the restraint device is not properly worn by the occupant.