When sourcing teen clothing, compliance with safety regulations is paramount. You must ensure products meet CPSIA (Consumer Product Safety Improvement Act) standards for the US market or REACH regulations for the EU, specifically regarding lead content, phthalates, and flammability. For fabric quality, prioritize OEKO-TEX Standard 100 certification to guarantee the absence of harmful substances. Additionally, check for colorfastness to perspiration and washing (Grade 4 or higher) to ensure the garments withstand the active lifestyle of teenagers.