Fashion forecasting involves predicting trends and styles that customers will want to purchase seasons in advance. It is necessary because the fashion industry works well ahead of seasons to manufacture products on time. Forecasting includes studying market conditions, lifestyles, past data, street fashion, and designer collections. Understanding target customers through research like surveys and focus groups is also important for forecasting. Developing a calendar with key event dates helps coordinate manufacturing and delivery to have the right products at the right time.