actually, it's a myth that red hides the color of blood. I know from experiance: I have a red shirt, and when it was bled on (some blood off me face), the marks appeared as darker red blotches. kinda like how water "darkens" the appearance of cloth, only...bloodier, and blood of course coagulates and darkens.
you're best bet is with darker blues or blacks, and even then...
If romans wore red (if), then it was for a religious context (mars (god)= planet=
red); the spartiatai, and, IIRC, the makedonians wore red as well. being both warrior cultures, i imagine they wore it as a religious symbol, to bring the gods closer to them, and aid them...or something to that effect.
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