People actually wear capes? In the real world?
Like at the opera?
'Would' actually wear.
It just doesn't look like it is a worn item but a prop item if that makes sense. I used to do theater and costumes have a certain look. Whereas something actually worn, looks different.
I'm a little confused as to what you mean by what is worn vs. prop, because he definitely is wearing it and doing stunts in it rather successfully.
In terms of how it looks... Well, it is a comic book movie after all. Do you judge Cap for carrying a shield around simply because normal people wouldn't do that? Dr. Strange is meant to essentially look like a highly imposing magician.
Unrealistic, you're right about that. But straight out of the pages of the comic? Absolutely.