In The Ancient City, the author compares details of several kinds of Greek clothing. What is the central idea that connects all the clothing the author describes?

The shared feature is the basic shape of the fabric: Greek garments such as the chiton and himation were formed from rectangular pieces of cloth, then folded, draped, pinned, or fastened in different ways. Shoulder pins or knots may describe some garments, but not all of them. So the central idea is that they were all made from rectangular cloth.

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