Brands should approve denim wash effects before bulk production because wash results can affect color, hand feel, shrinkage, fading, distressing, and overall appearance. For custom denim jackets, wash approval is one of the most important steps in the sampling process.

Buyers can provide wash reference photos, physical samples, Pantone references, wash panels, or approved sample garments. The approval should cover shade, fading level, whisker effect, distressing position, hand feel, and overall consistency.

Before bulk production, the factory and buyer should confirm the approved sample standard. This helps reduce disputes caused by color variation, over-washing, under-washing, shrinkage, or inconsistent distressing effects.