The best way to understand the consumers' needs and therefore predict fashion trends is through market research. There are two research methods: primary and secondary. Secondary methods are taking other information that has already been collected, for example using a book or an article for research. Primary research is collecting data through surveys, interviews, observation, and/or focus groups.
1 : to give shape or form to : to make, construct, or create (something) usually with careful attention or by the use of imagination and ingenuity fashion a lamp from an old churn a figure fashioned from clay … delegating to the commander-in-chief the power to fashion the rules of the military justice system …— Fred Strasser Up there in the mountains old ladies … are still hooking rugs … and fashioning dainty dolls out of corn shucks.— Richard Atcheson