is an opening in a garment intended for buttoning or trimming. Buttonholes are divided according to the finish of the opening edges. Passpoil buttonhole is finished with fabric passpoils Worked buttonhole is worked over by hand or machine. Bound buttonhole is made by finishing the slit with fabric, leather, metal or plastic material. Sealed buttonhole is made by applying high-frequency current on thermoplastic materials. In-seam buttonhole is made by discontinued stitches in the seam, ends of the opening are in the bent material. A buttonhole opening has various shapes based its function: Slotted buttonholes are typical buttonholes that can be divided into: double bar tack/linen/, fan /dressmaker's/, and keyhole /tailored/. Round buttonhole is circular or oval. Angle buttonhole is triangular or angular. Round and angle buttonholes serve as outlets or air holes or as a trimming. Horizontal buttonhole - a buttonhole parallel to the buttoned edge of a garment. Lateral buttonhole - a buttonhole lateral to the buttoned edge of a garment. Diagonal buttonhole - a buttonhole diagonal to the buttoned edge of a garment. Fan buttonhole - a buttonhole with a fan at one end and a bar tack at the other. Double bar tack buttonhole - a buttonhole with bar tacks at both ends. Keyhole buttonhole - a buttonhole with a round hole at one end and bar tack at the other. [[101435|Bar tack ]]- hand- or machine-worked reinforcement of a buttonhole's ends, pocket, slit etc., it is made by stitching over several times with varied trimming. Machine-worked bar tacks are straight, wedge-shaped and shaped.
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