In Poland, they created a T-shirt for monitoring the work of the heart.

The Silesian University of Technology has created a T-shirt that conducts 24-hour ECG monitoring - assesses the state of the heart throughout the day. It can be washed and reused many times. The heartbeat is monitored in real time by a superconductive material on the inside of a T-shirt. It replaces traditional chest electrodes and a special device that people are forced to wear for daily monitoring.