How to sew Sleeves of a Casual Cotton Jacket for Men - Flat-felled seam

Flat-felled seam.

The white strip is just a "PP strap" that is often used for packing work.
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.
It is used for stitch guide in this case.(16:39)

The bigger white strip is hard interfacing that is usually used for waist band. It is almost for same as "PP strap". (16:35)

The pink tape is made of urethane foam with a sticky surface.
It is very useful as a guideline for stitching. We buy them in a kind of professional shop in Japan. The information of this shop is secret.(04:26)
1 needle sewing machine : DDL-5571N JUKI
Button hole sewing machine : DIANA D-2002- BABYLOCK
Paris collection, Tokyo collection etc... Sample garment factory Atelier Saison.
We have sewed in Tokyo for more than 35 years.

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