There is one specific message I have been sharing in the Sashiko we practice- "The Thread Matters". In order to have a good stitching, the practice & experience is, of course, important. However, there is one step I can advise you to improve your stitching - which is choosing the appropriate thread.
I have been using very specific kind of thread (Coron & Sashi.Co).
To answer the request for the different thickness of Sashiko thread, I had tested this Daruma Sashiko thread for more than a year, and then started offering them in 2019. It has been a great pleasure to offer them, and here is a value pack that you can get all 5 necessary colors I normally use in our Sashiko project with Daruma Sashiko thread.
Made in Japan
40 meter per skein (small size)
【Color in the package】
02 Original White
06 Indigo Blue
07 Akane-Red (Matte)
*We have 2 thickness - thick and thin.
About the weight/thickness of Daruma Sashiko Thread by Yokota.
The thickness is a bit less than 1.0 mm like 0.9mm or so. You may feel it is almost 0.8 mm. Please refer to the photo on the article below. (Cotton 100%, unit: 20/6 )
This is the thinest Sashiko thread we carry. I would say it is about 0.75 mm or even 0.7 mm. The thickness changed depends on the tension. The thread on all the photo (article below) have no tension. (Cotton 100%, unit: 20/4 )