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Regarding this, what is a pin hem?
The pin hem is a fine hem, that when finished can be as narrow as a pin! Therefore, it works best on lightweight fabrics such as chiffon, and if you are using a pin hem on a fabric that easily frays easily, it would be best to use a 1.5 cm or 2 cm seam allowance to start!
Keeping this in view, can you hem satin?
When hemming satin you can make a rolled hem by hand or by machine, or you can use an interfaced hem which you can do by hand. 2. Rolled hems should be used for curved areas and a french seam is great for straight seams.
In sewing, to tack or baste is to make quick, temporary stitching intended to be removed. To easily hold a seam or trim in place until it can be permanently sewn, usually with a long running stitch made by hand or machine called a tacking stitch or basting stitch.