Stola...which is correct?

[Magnus]

I'm trying to research information on the Stola. I've found conflicting sources...

The top...it's not stitched at the shoulder which I understand. However, what is the most common way to fasten the front and back halves? Fibulae? Ties?

Second, was there two belts worn on it...one around the breasts, and one at the waist, or one wide belt at the waist? What was the belt made from?

Was the Stola always worn over an under-tunic?

I found this site which was decent, but from some others, it seems there was some variation or the information is incorrect.

http://www.roman-colosseum.info/roman-cl.../stola.htm