I was poking around on the web and ran across some very interesting resources on handveaving velvet. The first item I ran across was this video and while it is in French it is actually quite simple to see what is going on. The weaver is using rods to get the pile and then slitting the pile to get the velvet.
Another ws running across a Weavezine article by Syne Mitchell regarding Dr.Barbara Setsu Pickett who teaches in Oregon.
I have often wondered seeing Navajo Women with all their velvet if the Navajo weavers actually wove velvet or if that is a new addition to their wardrobe.