Can I use a hider shader?

ugurtekdal

I want to render only front side of a bra or front side of a hair. Is it possible?

Just like KindredArt's https://www.daz3d.com/iray-hdri-toolkit

Can I use them as shader or something like that?

Richard Haseltine

Something like this and set the back-face to be fully transparent might work https://www.daz3d.com/oso-janus-double-sided-shader-merchant-resource-for-iray