[moose07]

Wearing Armour in court could have been considered against the dress code.

[Darksheare]

Armor was painted.
Usually a lacquer for “dress” armor, not worn in court but for other functions, the lacquer lasted awhile.
The usual method of painting was a wash, much like a lime wash, that didn’t last.

Linen was also a cloth type in use at the time.

[Darksheare]

Armor, for the most part though, wasn’t painted.
That was rare, and more time consuming than gilding or engraving.
Gilding armor took skill, and went hand in hand with engraving.