When you’re working in the hospital, you don’t want to ever get caught with your medical scrub pants down. Time is of the essence and you have more things to do than worry about whether your scrubs are going to hold up under the pressure of a long shift.
Medical uniforms have evolved ever since the earlier restrictive uniforms of even the middle of the last century. Now, they are much more comfortable and usable. You might not even notice that they are there at all.
You don’t even need to spend a lot of money. Discount medical scrubs might sound like they are not suitable to a high performing hospital situation, but they are just as good as any high end fashion pair.