In Roman times the concept of a "knight" did not exist. Your question is therefore meaningless.
Blue.Hope it Helped.
they trained
heavy armorIn medieval times, knights wore armour when going in to battle.
The colour that only the Roman emperor was allowed to wear was purple.
knights wear armor such as mail that protects their upper half
Robes
Knights in Medieval times often wore a combination of colors on their clothing and armor, with each color representing different aspects such as nobility, bravery, or loyalty. Common colors included red, blue, green, and black. These colors were not just for decorative purposes but also served to identify the knight's allegiance and social status.
Some wear a garter hence Knights of the Garter (K.G.). Knights might also wear woolen under garments. When not wearing amour (modern day) on official functions, they wear a cap and robe.
clothes
Sabatons
The wear shining armor.
They would wear suits of metal plate armor, but early knights wore tough leather