How to handmade a belt?

This video primarily demonstrates the process of handcrafting a belt. Although relatively simpler than making a bag, the hand-sewing process still takes time. I hope you enjoy it.
My store: www.freesiabag.com

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Hello, I would like to know for belts 3.5 or 3.8 cm wide, how many cm wide should I cut the belt with this inner leather?