Treffen die Stoffkanten nicht in der Mitte aufeinander, war er zu klein.
Im Idealfall steht die Zugabe in der Mitte der Rückseite ein bißchen hoch - je stärker der Stoff zum fransen neigt, desto mehr Zugabe sollte hochstehen.
marquise.deIdeally, the 5 mm allowance should stick up in the middle to form a shank.
In case of a thick fabric that does t tend to fray, the shank may be smaller or even nonexistent so as not to distort the buttonhole by its thickness.
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