I heard about the product a while ago but finally found it, the LifeShirt from VivoMetrics.

The Shirt "collect and analyze continuous ambulatory physiologic data to enhance pharmaceutical research". Whoever asked the doctor knows that usually the data from 1-2 hour sleep at the hospital are not serious enough (or often useless). With the shirt you can measure all day long. That makes a huge difference in the quality of the data. VivoMetrics says it is already used in over 1000 hospitals. From what I heard it is around 15.000 US$ for 5 shirts, recorder and software. So, maybe not the shirt I'm looking for this summer (But it is used at Stanford University for research for example. (But I could'nt find Frank Wilhelm who is cited in the promo-video as a Senior Research Scholar at Stanford in the Stanford people dirctory. Who knows...?)).

So, what kind of data is it collecting while you sleep (or walk and work):

"The LifeShirt System collects, analyzes and reports on the subject's pulmonary cardiac and posture data. It also correlates data collected by optional peripheral devices that measure blood pressure, blood oxygen saturation, EEG, EOG, periodic leg movement, core body temperature, skin temperature, end tidal CO2, and cough."(pictures taken from VivoMetrics promotional video)