Input-output norms for silk exports set permitted input ratios and wastage allowances for fabrics and garments. SION J124 prescribes input-output norms for 100% natural silk fabrics, made-ups, sarees and garments, specifying required input proportions for various raw silk and silk yarn types and providing altered allowances for garment exports; beads, sequins and chattons are allowed on a net plus 1% wastage basis and lining material on a net plus 5% wastage basis. Applicants must ensure imported goods are those used or required in the export product, with the schedule determining permissible input proportions for manufacture.