tunic
noun
[ ˈtjuːnɪk ]
• a loose garment, typically sleeveless and reaching to the knees, as worn in ancient Greece and Rome.
• a close-fitting short coat as part of a uniform, especially a police or military uniform.
• an integument or membrane enclosing or lining an organ or part.
Origin:
Old English, from Old French tunique or Latin tunica .