A system for transmitting signals from a garment to an analysis device, is provided. The system includes a button attachable to the garment by means of a pin passing through a hole arranged in a garment coupling portion to be clamped between a head of said pin and a button coupling surface. The button coupling surface includes an electric contact connected to at least one integrated circuit contained in the button for performing analog and digital processing of signals coming from at least one garment sensor. The button contains a wireless module for communicating data between the button and an analysis device. The garment coupling portion is provided with at least one conductive trace arranged on its surface and which faces the button coupling surface. The electric contact is arranged in order to contact at least one conductive trace.