The key indicator for assessing sewing thread quality is ‌sewability‌. Sewability refers to a thread’s ability to sew smoothly, form high-quality stitches, and maintain consistent mechanical properties within the stitches under standard conditions. Sewability directly impacts clothing production efficiency, sewing quality, and garment performance. According to industry standards, sewing threads are classified into First Grade, Second Grade, and Substandard. To ensure optimal sewability and satisfactory results in garment production, selecting and using sewing threads correctly is crucial. The principles for proper thread usage are as follows:

1. ‌Compatibility with Fabric Properties‌:
The thread material should match or closely resemble the fabric’s composition (e.g., cotton, polyester, silk) to ensure consistency in shrinkage, heat resistance, abrasion resistance, and durability. This prevents uneven shrinkage or wrinkling caused by mismatched properties.

2. ‌Alignment with Garment Type‌:
Specialized garments require threads with specific functions. For example: elastic garments need elastic threads; firefighter uniforms require heat-resistant, flame-retardant, and waterproof-treated threads.

3. ‌Coordination with Stitch Type‌:
Thread selection should adapt to the stitch used in different garment sections:

- Overlocking requires fluffy or textured threads.

- Double-thread stitches need highly elastic threads.

- Seams (e.g., crotch, shoulder) demand strong, durable threads.

- Buttonhole threads must prioritize abrasion resistance.

4. ‌Balance Between Quality and Cost‌:
Thread quality and price should align with the garment’s tier: premium garments use high-quality, higher-priced threads; mid- to low-tier garments use standard-quality, cost-effective threads.

 Select Sewing Thread     High Tenacity Polyester    Bonded Nylon 6.6