When sourcing Muslim apparel, prioritize breathable, high-quality fabrics such as Nida, Lexi, or Crepe for durability and comfort in warm climates. Ensure the fabric weight (GSM) is sufficient to maintain modesty (non-transparency), which is a core requirement. Check for stitching density (at least 10-12 stitches per inch) and colorfastness to prevent fading after multiple washes. For premium markets, look for OEKO-TEX Standard 100 certification to ensure the textiles are free from harmful substances.