Thx for hint, but could'n find any tutorials or pictures how to make stitches with Hair modifier. Any links or own practices?

Hi,
I've faced a problem how to make automotive stitches. Below is latest progress with displacement, but I'm still not happy.
Could you guys share you workflow how to make stitches?

Well, those are two independent surfaces, although identical, meaning I can do Unwrapping with no problems. But trick with mid level works fine, THX!

Actually this is the car steer wheel model and I tryed to make stitches with displacement, as shown here:

https://www.behance.net/gallery/72194483 ...

Hi,
I made two identical objects and applied a displacement map to one of them. The most of displacement texture is black, meaning no displacement. The result is unexpected. See pics below. How to fix?

Second picture is same but with opacity map (same texture as for displacement).
The displacement ...

Geometry isn't perfect. Look the sideline reflections. Headlights glass is too close to body. Everything is just to my vision.

Thanks for looking - if you have any useful tips, I'd be happy to hear them.

In the 1st picture hairs are too thick however more realistic. Would you show the same hairs but thinner?

First are better although not perfect

Sorry that switch from English for a moment....
Спс за критику!
Ну да, освещение не соответствует заднику, т.к. на мой вкус такое лучше с художественной точки зрения. Допиливать не охота, энтузиазм к этой работе пропал

Test scene with SUV concept. Path tracing about 3000 samples

Good, except the mat of the central part of the steering wheel and the backplate image. How about the exterior?