The invention concerns a device for identifying a clothing family index (Clo), the index in particular representing the type and level of clothing of a passenger of a motor vehicle, comprising: —at least one camera (2) designed to capture at least one image of a part of the clothing of the passenger (P), —a processing unit (3) designed to determine at least one clothing family index (Clo) by using a recognition algorithm based on a neural network model, trained in particular on a library (5) of representative images captured by the camera, images preferably categorised beforehand by a human operator.