Based on 40 years of applied photo-optical study. IMHO Patent Leather shoes would offer a very poor choice of mirror for glimpsing the forbidden nether regions of unsuspecting schoolgirls. Think for a moment about the right-hand wing mirror on your car-left hand for our friends across the pond.
You know the one...It has the words "Objects In Mirror are closer than they appear to be" embossed into the surface. The reason that those object appear smaller is that the surface of the mirror isn't flat; it's curved, with an outward bulge in the middle*. (An inward curve would magnify the image within a certain range; much like a makeup mirror.)
The greater the outward curve, the smaller an object a given distance from the mirror would appear to an observer.
If you wrap your mirror-shoe around a foot, the curve would be profound; and any view of the object de amour's fundamentals would likely reside only in the mind of the beholder.

It is also stupid to have a blck mirror. Even with a highly polished surface, the light loss would betremendous.
On the other hand, George Patten leather shoes were pretty effective in kicking Nazi ass out of the Ardennes in early 1945.

So, here's the question, you pervs. In your long-gone callow youth, did any of you randy schoolboys ACTUALLY gotten a glimpse of schoolgirls undies by staring intently at their shoes?
To me the whole idea seems much like an urban legend spread by the very nuns who were supposedly guiding their charges toward a proper and chaste life as an example of the lengths those grotty boys will go to because of their evil, sinful nature.


*much like those hyper-excitable schoolboys and library pervs.