Material quality 

High-quality fabric is determined by its material composition, weave, and feel, with natural fibers like silk, wool, linen, and cotton often indicating superior quality. Other indicators include a consistent and tight weave, a smooth and pleasant texture, vibrant and even color, and durability. You can assess quality by touching, stretching, and holding the fabric up to light to check for density, and by examining the weave and color for consistency.