As a fashion and catalog photographer moire is an issue I am all too familiar with. These days, as more and more cameras opt to do without the low pass filter, you might find yourself dealing with moire in some unfortunate places. Adorama has put together a wonderful video that explains moire, how to avoid it before taking a shot, and how to deal with it after the shot has already been captured.
When shooting clothing moire is something I deal with quite often. With the higher resolution cameras of today the issue is not as prominent as it used to be, but even still, moire can creep up in some circumstances. There are certain precautions you can take before you capture your image to help prevent the issue. Gavin Hoey goes over these steps in his Adorama video. Sometimes moire is unavoidable though, and if that is the case, he also offers a look at how you can easily remove these artifacts in your post process.