When evaluating quality, focus on the embroidery density and thread type. High-quality shoes use rayon or silk threads for a vibrant sheen and tight stitching (minimum 300-400 stitches per square inch) to prevent fraying. The upper material is equally critical; for traditional styles, silk, satin, or high-grade canvas are standard, while modern versions may use synthetic leather (PU). Ensure the sole material is specified—TPR (Thermoplastic Rubber) or natural rubber provides better slip resistance and durability compared to cheap PVC.