I’ve bought some interesting thread for upper layer of wrapping mari! It is no-name sewing fiber for stockinet. Sorry, if I didn’t find proper name in English, but I have a picture:

If you release a thread from a spool, you can see it is not woven, it is just fiber. Careful, it becomes entangled easily.

The best way is not wrapping upper level right on the yarn, but do some ordinary thread layer (maybe from the cheaper thread and not very fine) and wrap this fiber over the thread.

The result is very fancy: it is like hatching on the charcoal drawing.

I like it! I’ll try to stitch a pattern and will show the result here, so, please, stay tuned ;)