Touch and feel as many different fabrics as possible, learn their names and what they’re typically used for.
Most anime and cartoon designs are highly stylized and don’t really show any texture, just plain colors. Still, the animation may give you a hint through the way the fabric flows or hugs the body. You may also find clues in cover illustrations or concept art which are often more detailed. Telling the type of fabric from the way it drapes or flows is a matter of experience, so if you haven’t worked with a variety of fabrics before, it’s time for regular trips to the fabric store! Touch and feel as many different fabrics as possible, learn their names and what they’re typically used for.