The Vestal Virgin Septuple Braid Tutorial
“No vestal virgin portrait reveals its hairstyle in full detail,” says hairdresser Janet Stephens, the host of this 17-minute (!) video about the seni crines hairstyle worn by ancient Roman brides and Vestal Virgins, but “this presentation is the first to demonstrate how a vestal virgin hairstyle was likely constructed.”
Janet also has an incredible YouTube account in general.
Update: More information here (“I’m sure they had to make some workarounds occasionally for a Vestal who had less-than-adequate hair”).