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

Early Western travelers, traveling whether to India, Persia, Turkey or China, would frequently remark on the absence of change in fashion in those countries. The Japanese shōgun's secretary bragged (not completely accurately) to a Spanish visitor in 1609 that Japanese clothing had not changed in over a thousand years.[6] However, there is considerable evidence in Ming China of rapidly changing fashions in Chinese clothing.[7] Changes in costume often took place at times of economic or social change, as occurred in ancient Rome and the medieval Caliphate, followed by a long period without major changes. In 8th-century Moorish Spain, the musician Ziryab introduced to Córdoba[8][unreliable source][9] sophisticated clothing-styles based on seasonal and daily fashions from his native Baghdad, modified by his own inspiration. Similar changes in fashion occurred in the 11th century in the Middle East following the arrival of the Turks, who introduced clothing styles from Central Asia and the Far East.[10]
The beginning in Europe of continual and increasingly rapid change in clothing styles can be fairly reliably dated. Historians, including James Laver and Fernand Braudel, date the start of Western fashion in clothing to the middle of the 14th century,[12][13] though they tend to rely heavily on contemporary imagery[14] and illuminated manuscripts were not common before the fourteenth century.[15] The most dramatic early change in fashion was a sudden drastic shortening and tightening of the male over-garment from calf-length to barely covering the buttocks,[16] sometimes accompanied with stuffing in the chest to make it look bigger.
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
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