BARCELONA, Spain — Two years ago, Spanish retailer Mango could barely convince its employees to wear its dresses, skirts, and blouses, which many workers — and customers — thought were too formal. Today, Mango has ditched the glitz in favor of more casual attire like that from Spanish rival Inditex SA, the world’s biggest seller of apparel and owner of the Zara brand. The change has helped Mango outpace Inditex in Spain’s 16.2 billion-euro ($21 billion) clothing market. “We had gone way too far with our focus on clothes for parties and events,” said Enric Casi, general manager of the Barcelona-based retailer. “Not even our employees wore Mango.” The casual push wasn’t the only lesson Mango took from Arteixo, Spain-based Inditex as it…

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