Trim device for vehicle net curtain, and correspondent clip and vehicle

The device has a cover (11) including a visible portion (111) supported on a lining (24) of a door, and a holding portion (112).The visible portion is inserted in a slit (26). A fastener (12) connects the holding portion with a corresponding edge of the lining. The fastener has a protective cover (123) whose surface is in contact with an occultation blind. An independent claim is also included for a motor vehicle comprising a covering device.