About the light female armors:
You just need to wear the shape and alpha layer.
Then you can choose one of the 2 versions (opaque and reflex)
Since the armors are MOD you can play arpund with the shininess, just remember making a copy before chaging any default feature in case you are not happy after making them.
Second life graphic engine allow 2 major types of rendering.
The basic one is the one we all have by default., but users with advanced graphic cards have access (in the graphic preferences... control + p) to activate "lighting and shadows" which makes much more realistic textures and reflextions.
The reflex version was meant to use WITH "lighting and shadows" checked.
REFLEX VERSION
Regarding your graphic preferences (ctrl P) you will see these items in a different fashion:
_if you have "lighting and shadows" checked you will see them as a metal-like surface.
_if you have "lighting and shadows" unchecked you will see them as a mirror/plastic-like surface.
Try both and see which one is best for you.
See item in Second Life- 4 suits