How to make Pantaloons about 80% Sheer?

How to make Pantaloons about 80% Sheer? I have set them to use the pink satin iRay preset from MEC4D's iRay Shader Presets Volume 2 but that need to look sheer, like nylon stockings but pink.
Post edited by nonesuch00 on
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Dial in 0.8 to the cutout parametrs in surafces - I think it is called? If that doesn't work add a greyscale texture map that is filled with an RGB of around 204,204,204?
thanks. I had to try different percentages to get the sheerness I wanted but I didn't need to add a greyscale cutout map. I settled on 0.35 for the cutout map weight value in this case.
That setting makes the pantaloons 20% sheer. Opaque starts at 1.0.
Yes indded, as ever I got it base about apex
set Refraction index to 1.50 and Refraction Weight to 0.00