If there’s one thing you can say about the fashion industry, it’s that things happen fast. Your new sweater and slacks combination might be in style in the fall, but by the holidays you can be already out of fashion. What’s trendy inevitably changes as time goes on. This can make marketing difficult. You can’t really plan content for months or even weeks in advance. There may be a shift in the market, and what you think will be a big seller could turn out to be old news before you even get started.