ITT we come up with slurs for ancient peoples and stuff.
Romans: Imperial Spear Chuckers
They more often get killed and occupied by Turks than they do "" remove''''them
greeks - erudite kidfuckers
romans - fat'uns, romosexuals, damned eyeties, imperial wops
gauls - galls, headfuckers (from the skull collecting)
thracians - thrash'ems
egyptians - gyppos, river monkeys, crocmunchers
britons - isle monkeys, archipelago niggers
Nakedness was to prevent infection. If you have cloth fibers, those get pushed into the wound and you have all kinds of nastiness. Thus, you're more likely to survive minor wounds.
A helmet just protects your head, and you're not worried about cuts to that region, but blows.
Maybe originally, these days it's just a slur for Jews, used with no knowledge of whatever it might have meant originally.