I bet not everyone noticed, which why I called it subtle.
It might be obvious to you, but I've been astonished with people not noticing things I thought was utterly obvious and/or "right in front of your face".
Fair point. I have encountered the very same thing in life many times.
It just seemed to me that noticing the stripe, which is rather hard to see at times already, that the lack of collar to a collared uniform would be a very noticeable difference.