Steve Shanks at www.poserworld.com has made various period clothes including chlamydas, Greek chitons, etc. Be aware though that some of the older stuff was made for Poser 3 and is not conformable but poseable, you apply the character's pose to it, but the character cannot move arond with it on. If you're interested, Steve also has a tutorial to help you make these conformable with just a minor editing of the cr2. Also you can get his Chancellor Vallorum outfit for a robe. On Poseworld cd1 there's also a male gown. Sprout, http://scorpiostudios.virtualave.net/ also has a Roman's legionnaires outfit, cuirass, helmet and all. You may also want to try Baument's, http://www.baument.com/ for a couple of togas, tunics but these are just props and must be parented.