[_russelldb]

But before I mean. They have video of a person, that person is wearing a full length wide skirt...or full body robe?

[ovi256]

That's basically mesh opaque to visible wavelengths.

The effect would be that you can't observe limb or limb part movement inside the skirt, but only how they move and deform the skirt volume. I think that's still enough, given that gait recognition works on people in burkas or other well covering garments.