In reality, the toga was worn by the people of the Roman Republic (509 BC - 27 BC). Despite what you may have also seen at a Greek function in college or on my favorite episode of Saved by the Bell (you know, the one where Zack takes his Dad's car without permission to go to a toga party, gets drunk and crashes the car? I tried to find a picture I really did!), togas were not worn alone. Rather, they were worn over a tunic and showed very little skin. Speaking of tunics, now a days tunics are a garment for women whose length is in between a shirt and a dress. In Roman times, a tunic was worn by men and women, had short sleeves and hit above the knee although some variation were shorter.
The color coding of togas is quite extensive and if I wrote about it this post would be way too long but it is really interesting stuff. I highly recommend anyone who is interested in this period in history look into it.