The fabric seems to be a mixture of cotton and recycled fiber. (Burn fabric and verify)

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The white strip is just a "PP strap". (05:18)
This is in order not to slide while sewing (sewing gap).
When the thickness of the fabric is different, the pressure of the presser foot and the feed dog are not stable.
Putting this tape means adding the height, this is very useful.

1 needle sewing machine : DDL-5550N JUKI
1 needle overlock sewing machine : MO-3604 JUKI

Paris collection, Tokyo collection etc... Sample garment factory Atelier Saison.
We have sewed at Shibuya-ku, Jingumae in Tokyo for more than 35 years.

This is a machine translation and may not be a perfect translation

#Sewing