When sourcing tailor-made shirts, the fabric composition and weave are paramount. Prioritize 100% Long-Staple Cotton (such as Egyptian or Pima) for breathability and durability. Pay close attention to the Yarn Count; a higher count like 100s/2 or 120s/2 indicates a finer, smoother fabric suitable for premium markets. Additionally, verify the fabric weight (GSM) to ensure it matches the intended season—typically 100-120 GSM for year-round wear. For functional requirements, inquire about Non-Iron or Easy-Care finishes, ensuring they meet OEKO-TEX Standard 100 for chemical safety.