Since Update June 2015, it's possible to control the reflection of modded items. Reflection textures can't have their blendmodes changed, blending is configured to be additive. This makes it possible, with a little trick, to actually remove reflections from dress items.

Adding reflection requires an additional texture to be added to the mods. There's a simple naming convention to follow: Just add a texture with the modded texture name and add .refl to the filename:

E.g. to add reflection to the fetish skirt F_Fetish001_Skirt.png just add a second texture named F_Fetish001_Skirt.refl.png. This texture will then be used as the reflection texture.