I am trying... but I do not get any result like yours .. hm ... I have a really nice glitter with the Superfly Lights included in Poser 13... if I use the lightning from background, it will look flat like Rhia474 said.

I left the size of the flakes, I actually like them and they are nice with metallic :D

left: only light trough background

right: only superfly light "Paramount"

I think for a solid glitter I found a good solution for me ... now I am thinking about a sheer glitter for clothing like in Fabianas "Essentials Vol 3 Sheers"