The German school of swordsmanship is more of a guide to fencing in south Germany than warfare across Europe. Reading up on it, there‘s also no mention of chain mail on that Wiki page. I would like to read up on an actual source of that because by the looks of it the author could’ve just come to their own conclusions here.
In Europe, use of mail hauberks continued up through the 14th century, when plate armor began to supplant it. Some knights continued to wear chain hauberks, however, underneath plate armor.[13] It remained in usage until the Renaissance.[10]
Milanese armour was characterised by its round, bulky shape and asymmetrical construction. A full suit of chain mail was also usually worn underneath the Milanese armour. In Germany, the Gothic armour was predominant, as well as later on the cuirass. The Gothic armour was characterised by its slimmer and more delicate construction. In addition, a complete chain mail shirt was rarely worn under the Gothic armour; more often, chain mail pieces were attached to the doublet in such a way that they covered the weak points of the armour.
The German school of swordsmanship is more of a guide to fencing in south Germany than warfare across Europe. Reading up on it, there‘s also no mention of chain mail on that Wiki page. I would like to read up on an actual source of that because by the looks of it the author could’ve just come to their own conclusions here.
https://en.wikipedia.org/wiki/Hauberk
Translated from german with DeepL:
https://de.wikipedia.org/wiki/Rüstung_(Schutzkleidung)
Here is an example picture of a Milanese Armour: https://en.m.wikipedia.org/wiki/Giano_II_di_Campofregoso#/media/File:HJRK_A_11_-_Armour_of_Giano_II_di_Campofregoso.jpg