By Casey Hall SHANGHAI (Reuters) – Expensive beauty hauls are a thing of the past for Evelyn Zhu. The Chinese branding professional says she now only spends on skincare essentials, joining millions of other consumers who have cut back on cosmetics in the world’s second biggest market. “In recent years we all bought so many products,” the 32-year-old from the affluent eastern city of Hangzhou said. “My bathroom cupboard is full, it’s hard to say I need much more.” This restraint, which has taken hold amid a slowing economy, spells bad news for global firms such as L’Oreal, Estee Lauder and LVMH…