I wish I had not been so busy, and I could have responded to this sooner.

I haven't seen German sallets of this era painted (other than the later black sallets) - however, there is evidence for them being cloth covered. Das Mittlealteres Hausbuch, shows sallets that are cloth covered (well, a lot of them are deep kettlehats. We also have documentary evidence for them being covered in rich cloth in the duke of Burgundies household account books (cloth of gold, in some examples). The tapestry of the deeds of Alexander also depict sallets covered in rich cloth - the bowl being covered, and with decorative rivets as seen on surviving barbute covered in velvet, but with the brow reenforce and visor being bare metal.

--------------------