OK here are few renders 

First one is Sexy Dress II with R3D textures as you can see transparency are again over the place 

Here is same render but postworked with PS(I've adjusted only levels)

Third render and there I've plugged between the transparency map Math_Function ,set this to Gain and under Value_2 I've put 0.8 and transparency now looks like should 

Same above(3rd) render,but now has been postworked in PS(levels only)

Thanks,Jura