Rear view of late Roman toga needed

[Decebalus]

I`m in the process of designing some 4th century senators for the flat tin-figure market and have some problems concerning the draping of the toga.
Does anybody have a picture of the rear view of a 4th century togatus or know a link where I can find one, please?
I have dozens of pictures of front views but need a rear view to fully understand the draping.

Thanks a lot,

Decebalus/Andreas Gagelmann