Printed on the waistband and in constant contact with the skin is an electronic biosensor, designed to measure blood pressure, heart rate and other vital signs.
The technology, developed by nano-engineering professor Joseph Wang of University of California San Diego and his team, breaks new ground in the field of intelligent textiles and is part of shift in focus in healthcare from hospital-based treatment to home-based management.
The method is similar to conventional screen-printing although the ink contains carbon electrodes.
The project is being funded by the U.S. military with American troops likely to be the first recipients.
"This specific project involves monitoring the injury of soldiers during battlefield surgery and the goal is to develop minimally invasive sensors that can locate, in the field, and identify the type of injury," Wang told Reuters Television.
Ultimately, the biosensor that detects an injury will also be able to direct the release of drugs to relieve pain and even treat the wound.
But the technology's range of application goes beyond the military.
"We envision all the trend of personalized medicine for remote monitoring of the elderly at home, monitoring a wide range of biomedical markers, like cardiac markers, alerting for any potential stroke, diabetic changes and other changes related to other biomedical scenario," said Wang.
Wearable biosensors can also provide valuable information to athletes or even measure blood alcohol levels.
But Wang said it could be some time before these smart underpants are worn by soldiers in the field as more work is needed to ensure these monitoring systems are robust and durable enough to cope with the wearer's daily activity.
However he said there are growing needs for developing reliable, wearable healthcare monitoring systems.
"While clothing-integrated electrochemical sensors hold considerable promise for future healthcare, military or sport applications, such non-invasive textile-based sensing requires proper attention to key challenges of sample delivery to the electrode surface and of sensor calibration and interconnection," Wang's team said in a report published in The Royal Society of Chemistry journal.