Print Scrub Tops...why?

My uncle’s ex-wife at one point in time was a nursing assistant. It’s been a while since I’ve seen her, and so I haven’t been in the loop to see if she was still doing that gig. But I always wondered (but was too err shy to ask), why do nurses wear those crazy print scrub tops? I mean some look cute, but the majority of them look just horrid. Like old 80’s bed sheet horrid. It’s just a mystery to me.