I don't know. A thousand dudes in camo sundresses charging over a hill might be disconcerting to the enemy. Whatever works.
A Celtic Cult of Nudity
Towards the end of the 3rd century BC, an attempt was made by a coalition of Celtic tribes from Cisalpine Gaul (the part of northern Italy inhabited by the Gauls) to attack the Roman Republic. This coalition included the Insubres, the Boii and the Taurisci. One of the decisive battles during this war was the Battle of Telamon, which was fought in 225 BC. From Polybius’ account of this battle, we hear about a ‘tribe’ of Celtic warriors known as the Gaesatae, whom the ancient author describes as having the habit of fighting naked.
To me it seems distracting to the overall tactical effort but I prefer practical results over style and flash. We have lost that in a lot of places.