I've tried quite a few of them in my time, and people only seem to notice after I point it out to them.
I've tried.. Upside down an buttons, no ab buttons, no holster, forearms on wrong arms, odd hand plates chest tucked in ab plate, upside down belt with flipped over belt boxes. The only thing I didn't try as it was painful was shins on wrong leg. Oh and I've never trooped with no tube stripes, but it's been on my list...