Revenge!
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Honestly, I wondered about that, on the other hand it is known, that parts of clothing in wounds can gave severe infections, so it might even be wise to appear nude on battlefield (not at the re-enactment!, with the many TV stations.) The man published the above pics was studying the possible skin colours, do your colleagues also do this blue skin paintings?
One of the historic novel I know by Cueni, I think, was pointing out, that romans were shocked by the nude attackers. I would wonder why,
Hah! This pic was taken at Old Ft McArthur Days, in San Pedro California in the mid 2000s. I used to do this event every year, when I lived there. Pretty sure those guys are from the old Legio IX Hispana, though I'd have to track down my old photos to be sure.
There are two known instances of Celts actually going nude into battle. One group was the Gaesatae (Spear men of Gaul), which was a special group of warriors that trained together as a unit, in the nude. It was thought that they did this 1) to prove how brave and worthy they were, and 2) to intimidate and confuse their enemy. They were a formidable fighting force, by all accounts, and trained specifically to fight in this fashion.
The second group to do it were a group of Galatians, making a last stand. These men were not in their prime, and had grown soft. It is thought that they did it in imitation of the Gaesatae, in hopes that they could intimidate their enemy and increase their own moral. They were described as pasty, round, and flabby, and they were quickly crushed in a short infantry battle. They didn't stand a chance.
As for the blue dye...there are lots of questions about that. The later Picts were known to tattoo themselves with blue pigment. The contemporary Scythian cultures were known to tattoo themselves. There is some debate about whether or not the general 'Celtic' cultures tattooed themselves at all, used blue paint, or didn't do this, at all. If they did, it was probably thought to be some form of protective talisman for battle, or simply decoration, though, again, real evidence of it is scanty. If they did, it would most likely have been some form of woad dye. Interestingly, woad has been shown to have some antiseptic properties, though whether this was known, or how much it would help, is debatable.
On the whole, most Celtic warriors would not actually go nude. They would wear clothes. Bright clothes. The brightest and gaudiest they could afford. Unless, of course, they could afford armour. If they could afford a maille shirt, helmet, possibly felt or some sort of leather or padded garment, then they certainly would have worn that. They were all about flashiness, and displays of wealth...and they were not fools.