it was called a tunic or sometimes called a chiton. but you may be thinking of it being known as a toga.
toga i believe.
Toga is a traditional Roman garment worn by men in ancient Rome. It was a large piece of fabric draped over the body in a specific way to denote social status or occasion.
The Latin name for tunic is tunica.
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tunic
tunic
It was called stola. It was different than a man's tunic, which was called tunica. One difference was that it often had sleeves fastened with buckles. It went down to the feet. It often had a palla (a woollen mantle) over it and fastened on the right shoulder with a buckle. Many layers of cloth were used and arranged in different styles. This made its positioning complicated. A shorter stola with short sleeves was worn over a longer stola with long sleeves. It was made mainly of wool. In warm weather rich women wore silk stola. Linen stola, which were cool for the summer, were rare due to the scarcity of this fabric. Poorer women wore a simple stola with holes for the head and arms and put a belt around their wastes.
The Romans named the Greeks in Greece.
The name of the tunic worn by Greek men and women is called a chiton. Men's chitons hung to their knees, while women's chitons fell to their ankles.
Greeks
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It's a "Toga" or a standard version is the "Tunic" or "Tunica"