making an umbrella in blender I am trying to make a material for the umbrella cloth. They have a specific sheen and reflective nature almost like silk and they tend to stand out from other type of clothes. I've been trying to achieve such a look but, I am not very good at materials and no matter what I tweak, it either looking rubbishly rubberish or not like an umbrella cloth material.    

Here's one with general reflective surface which looks too smooth and not umbrella like:
I used IOR of .95 for this:    



I searched up that umbrella was made of nylon and it's IOR was 1.5 so I put that and, well:


The first one obviously looks better, but not close to an umbrella material but unless we view it from a reflective angle:  



Please provide me insight on creating this umbrella material which looks most realistic and physically correct.    

I've attached the .blend file with the hdr.
If the Sheen effect is not enough maybe you should plug an Input > Layer Weight > Fresnel in the factor of a Mix between a Glossy and a Diffuse (or a Principled BSDF). To give transparency mix with a Translucent node before the end, the fabric will only seem transparent if you face the light source. Also maybe you should use a Wave node to create a discrete polyester fabric texture (just some parallel stripes).