Different wearable textile ECG monitoring systems: (a) ECG T-shirt with active electrodes and connectors, adapted from [74]; (b) PEDOT:PSS-coated polyamide electrodes sewn into bras, adopted from [24]; (c) electrode placement for ECG measurement where plastic clamps were used to fix the electrodes onto the wrist, adopted from [92]; (d) ECG sensing wristband with printed and flexible electrodes, adapted from [91]; (e) wearable chest belt with silver-coated nylon woven electrodes and Bluetooth module, adopted from [123]; (f) ECG belt with wetting pad (above) and the embroidered electrodes (below), adopted from [103].