A system, comprising: a structural material of a wearable article , configured to enable wearable article to be worn on a body; a transmission circuit ; a piezoelectric generator , positioned with respect to the structural material in a configuration to be flexed to induce a voltage signal output, configured to output a signal having a voltage profile upon being flexed; a voltage sensor , coupled to the piezoelectric generator , configured to sense the voltage profile and output a sensor signal indicative of the voltage profile; an electronic data storage , coupled to the voltage sensor , configured to store voltage profile information based on the sensor data; and a comparator, coupled to the electronic data storage , configured to identify a change in the voltage profile information over time; wherein the transmission circuit is configured to transmit data indicative of a physical status of the wearable article based on the change in the voltage profile information over time; characterized in that : the transmission circuit is a wireless transmission circuit ; the voltage profile includes a peak voltage, relative to a baseline voltage, of a pulse, a rise time of the pulse, a fall time of the pulse, and a pulse duration, and wherein the change in the voltage profile is based on a change in the voltage profile of at least one of the peak voltage, the rise time, the fall time, and the pulse duration; and the data indicative of the physical status indicates a recommended replacement of the wearable article upon at least one of the rise time, the fall time, and the pulse duration decreasing by a predetermined amount. a structural material of a wearable article , configured to enable wearable article to be worn on a body; a transmission circuit ; a piezoelectric generator , positioned with respect to the structural material in a configuration to be flexed to induce a voltage signal output, configured to output a signal having a voltage profile upon being flexed; a voltage sensor , coupled to the piezoelectric generator , configured to sense the voltage profile and output a sensor signal indicative of the voltage profile; an electronic data storage , coupled to the voltage sensor , configured to store voltage profile information based on the sensor data; and a comparator, coupled to the electronic data storage , configured to identify a change in the voltage profile information over time; wherein the transmission circuit is configured to transmit data indicative of a physical status of the wearable article based on the change in the voltage profile information over time; characterized in that : the transmission circuit is a wireless transmission circuit ; the voltage profile includes a peak voltage, relative to a baseline voltage, of a pulse, a rise time of the pulse, a fall time of the pulse, and a pulse duration, and wherein the change in the voltage profile is based on a change in the voltage profile of at least one of the peak voltage, the rise time, the fall time, and the pulse duration; and the data indicative of the physical status indicates a recommended replacement of the wearable article upon at least one of the rise time, the fall time, and the pulse duration decreasing by a predetermined amount. the transmission circuit is a wireless transmission circuit ; the voltage profile includes a peak voltage, relative to a baseline voltage, of a pulse, a rise time of the pulse, a fall time of the pulse, and a pulse duration, and wherein the change in the voltage profile is based on a change in the voltage profile of at least one of the peak voltage, the rise time, the fall time, and the pulse duration; and the data indicative of the physical status indicates a recommended replacement of the wearable article upon at least one of the rise time, the fall time, and the pulse duration decreasing by a predetermined amount. <EOS>