It is used on a serger for a decorative finish or where stretch seams are desirable. Many of these threads can be used on both the sewing machine or serger. Experiment a little and discover some new uses for these exquisite specialty threads. Your fabric will influence the type of thread you select as well as its fiber content. Fiber content of your thread need not be the same as your fabric.
Heavyweight fabrics requires heavyweight thread and lightweight fabrics requires a finer thread.
Very light weight or sheer fabrics are best sewn with a very fine needle and an extra fine thread. Using the correct thread size may reduce puckering problems. Certain rayon threads may require cooler temperatures and metallics and nylons are heat sensitive. Select a thread color to match your fabric or one shade darker. When sewing plaids and multicolored background select thread to match the main color.