Stitch holders (safety pins) keep stitches or pieces in place while you adjust measurements or make fittings; they act as a “safe pause” that prevents your work from unravelling when moving the garment around. Sewing pins precisely secure hems, seams and reference points; if you need quick alignment on straight lines or multiple layers, T-pins provide visual stability and strong grip. When using steam or an iron, stainless steel pins prevent unwanted stains.
For delicate or thick materials where piercing is not advisable, use sewing clips/fabric clips (also known as wonder clips) to hold fabric and secure pieces without puncturing. Clips distribute pressure evenly and let you present visible edges without leaving marks. Think by purpose: preserving without sewing yet → safety pin; securing with minimal tolerance before machine or hand sewing → pin; presenting without marks or working with special fabrics → clip.