from the GNU version of the Collaborative International Dictionary of English
- n. A shirt worn by soldiers over their uniform, in order to be able to recognize one another in a night attack.
- n. An attack by surprise by soldiers wearing the camisado.
from The Century Dictionary and Cyclopedia
- n. An attack by surprise at night or at break of day: probably so called because made by soldiers wearing shirts over their armor, in order that they might be recognized by their friends in the dark.
- n. A shirt worn by soldiers over their armor in a night attack to enable them to recognize one another.
Sorry, no etymologies found.