Managing 1,000+ apparel SKUs is like high-speed Tetris—one wrong move and your margins evaporate. This guide covers the seven biggest mistakes brands make, from failing at SKU discipline to ignoring “warehouse smell.” We explain why barcode verification is non-negotiable and how to turn returns into a profit center through expert inspection and steaming. Avoid the “Multi-Warehouse Myth” that fragments your inventory and learn how a centralized, seller-minded hub with same-day fulfillment keeps your viral TikTok or Shopify drops profitable and your customers coming back for more.