In the 16th century, national differences were at their most pronounced. Ten 16th century portraits of German or Italian gentlemen may show ten entirely different hats. Albrecht Dürer illustrated the differences in his actual (or composite) contrast of Nuremberg and Venetian fashions at the close of the 15th century (illustration, right). The "Spanish style" of the late 16th century began the move back to synchronicity among upper-class Europeans, and after a struggle in the mid-17th century, French styles decisively took over leadership, a process completed in the 18th century.
Fashion trends are influenced by several factors including cinema, celebrities, climate, creative explorations, political, economical, social and technological. Examining these factors is called a PEST analysis. Fashion forecasters can use this information to help determine growth or decline of a particular trend. Fashion trends change daily, it can not stay unchanged
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