How to sew a Buckle Belt of a Trench Coat

How to sew Trench coat buckle belt (with slide adjuster swivel of main fabric).

Cut the main fabric and interfacing as a square(bigger than a belt), then attach both with ironing heat in this time.
As another way, cut the main and interfacing 1cm lager than the pattern (The amount of shrinkage with ironing heat), then attach both and cut according to the pattern.
This is also OK.

Pin buckle needs eyelet stitch or an eyelet.
Especially in order to pass the pin through the edge of the belt and stitch, need eyelet stitch or corded buttonhole, not eyelet.

The swivel is sewn by plain seam in this case.
If making the swivel by plain seam with a loop turner is difficult, making by closed gate fold is also OK.

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BGM composition : Button hole craftman

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