When sourcing from a factory, you must prioritize material composition and weight (e.g., 100% combed cotton, wool felt, or high-grade polyester). For structured items like fascinators or sun hats, verify the stiffness and shape retention capabilities. Ensure the factory uses colorfastness testing (Grade 4 or higher) to prevent bleeding. Additionally, check for stitching density (minimum 8-10 stitches per inch) and the quality of embellishments like sequins, beads, or veils, ensuring they are securely attached via industrial-grade adhesives or reinforced stitching.