Right Sized Thread for Different Fabrics - jipusi-yarn.com
For light weight fabrics such as batiste, chiffon, crepe, etc. a mercerized size 60 thread is good. It can be 100% polyester or cotton wrapped polyester.
For medium weight fabrics like corduroy, flannel, gabardine, gingham, linen, muslin, wool crepe, etc. a mercerized size 50 thread is good. It can be 100% polyester or cotton wrapped polyester.
For medium heavy weight fabrics like bonded wovens, canvas, coating, denim, duck, sailcloth, etc. a mercerized size 40 will do. It can be 100% polyester or cotton wrapped polyester "heavy duty" labeled thread.
For knits such as bonded knits, double knit, jersey, tricot, etc. somewhat fine polyester, nylon or cotton wrapped polyester threads are good.
Tips for Choosing the Right Sewing Thread
Consider the strength of the thread and the purpose it's going to serve.
All-purpose polyester thread works best for most projects done with a sewing machine.
Look for compatibility with the fabric's structure and try to select the one similar in fiber content of the fabric for sewing project.
Match the color of thread with the most dominant color in the fabric. If can't find it, select the one that is one or two shades darker. Never go for lighter shades, they tend to be more visible.
Use cotton thread for fabrics having little or no stretch as the stitches may break if used on a stretchy knit fabric.
Use polyester thread for synthetic or stretchy fabrics.
Use fine cotton or silk thread for very sheer or delicately woven fabrics like lingerie or sheer garments.
When using metallic thread for machine sewing, ensure that the thread is labeled suitable for machine sewing.
For quilting projects or similarly layered projects, use quilting thread which is all-cotton and has a finish that lets the thread to slip more easily through the fabric and batting layers.