I have read in an old discussion here in myArmoury that Duhrer's horsemen were intended to represent light cavalry armour. Though I found these representations pretty comprehensive, and that no-leg harness was supposed to be common by heavy cavalry in early 16th c. I eventually accepted that.

Dr. Tobias Capwell's commentaries on a Black Sallet at Wallace ( https://www.wallacecollection.org/blog/april-treasure-of-the-month-2020/ ) talked about Duhrer's intentions on light cavalry armour. I was convinced until I saw Paumgartner Altarpiece (c. 1500). There, Saint Estaquius is in light armor and Saint Georg in heavy:

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As you can see, George's armor is a three quarter one, so that raises the question: what defines a light or heavy armor in early 16th century Central Europe? And how common full armor remained in the 1500-1550 period?

Looking at the picture on the left, the ankle seem to be in the shape of what greaves would look. Could it be greaves covered by red cloth?

The terms "light" and "heavy" refer to the role played in battle, not the equipment. A naked spearman in a shield wall is classed as "heavy infantry". A fully armoured knight is classed as "light cavalry" if he is performing a scouting or skirmishing role.

Pietro Monte, writing around 1490-1500, has an excellent and extremely detailed discussion of his recommendations for light and heavy armours. It's definitely worth reading on this topic.

For those who don't already have it, there is a version here.

http://mikeprendergast.ie/wp-content/uploads/...ES-1.4.pdf