Scrubs are very comfortable to work, in this case is a physician who worked in the hospital. doctors working in hospitals treat patients and perform medical acts, he needed work clothes that can make it comfortable and still look attractive, then scrubs the choice of doctors to work.
scrubs are designed with a V-shaped neck and comes with two pockets on the front and scrubs are paired with pants are very comfortable to use. as an example a scene in the movie "scrubs" that can be viewed at: http://www.youtube.com/watch?v=hZAgT8KOLF8
on the video above you can see how a health care worker is very comfortable working with scrubs. he did not even look stiff while doing a lot of action and body movement.
in addition to the above reasons, why the gowns to be very comfortable to use for work is because it is made of cotton so comfortable, absorb sweat and are not easily damaged.