When sourcing safety work suits, prioritize flame-retardant (FR) fabrics such as Nomex, Modacrylic blends, or treated cotton (e.g., Proban) depending on the hazard level. For general industrial use, a polyester-cotton blend (65/35) is standard for balancing breathability and durability. Ensure the fabric weight is appropriate for the climate, typically ranging from 240gsm to 320gsm. Additionally, look for reinforced stitching (triple-needle) at stress points like the crotch and underarms to prevent tearing.