Compliance varies by region; for the US market, ensure fabrics meet CPSC flammability standards (16 CFR Part 1610). For the EU, verify that dyes and metallic embellishments are REACH compliant and free from harmful lead or nickel. Regarding sizing, do not rely on generic 'S/M/L' labels. Request a detailed size chart in centimeters and inches, and confirm if the supplier follows US, EU, or UK sizing blocks. Offering custom-to-measure (MTM) services is a significant competitive advantage in this category.