The current invention describes a belt (1), the fashion accessory to hold pants, including a buckle (C) closing on a leather (S), the leather (S) surrounds the hips of the user, characterized by the fact that the buckle (C) is equipped with and electronic board (10) including a battery (B), a main processor (20), and a wireless communication processor, a connection to sensors in the leather (S), the leather (S) is equipped with a length sensor (11) sensing the length of the belt after the closing on the buckle (C) on the leather (S), the electronic board (10) processing length data and sending them to a remote mobile terminal (T), a motor (30) controlled by the main processor (20) allows to loosen or tighten the belt.
