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 sh?gun's secretary bragged (not completely accurately) to a Spanish visitor in 1609 that Japanese clothing had not changed in over a thousand years. However, there is considerable evidence in Ming China of rapidly changing fashions in Chinese clothing. 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 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.

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, though they tend to rely heavily on contemporary imagery and illuminated manuscripts were not common before the fourteenth century. 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, sometimes accompanied with stuffing in the chest to make it look bigger. This created the distinctive Western outline of a tailored top worn over leggings or trousers.

The pace of change accelerated considerably in the following century, and women and men's fashion, especially in the dressing and adorning of the hair, became equally complex. Art historians are therefore able to use fashion with confidence and precision to date images, often to within five years, particularly in the case of images from the 15th century. Initially, changes in fashion led to a fragmentation across the upper classes of Europe of what had previously been a very similar style of dressing and the subsequent development of distinctive national styles. These national styles remained very different until a counter-movement in the 17th to 18th centuries imposed similar styles once again, mostly originating from Ancien Régime France. Though the rich usually led fashion, the increasing affluence of early modern Europe led to the bourgeoisie and even peasants following trends at a distance, but still uncomfortably close for the elites – a factor that Fernand Braudel regards as one of the main motors of changing fashion.

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.

Though different textile colors and patterns changed from year to year, the cut of a gentleman's coat and the length of his waistcoat, or the pattern to which a lady's dress was cut, changed more slowly. Men's fashions were largely derived from military models, and changes in a European male silhouette were galvanized in theaters of European war where gentleman officers had opportunities to make notes of foreign styles such as the "Steinkirk" cravat or necktie.

Though there had been distribution of dressed dolls from France since the 16th century and Abraham Bosse had produced engravings of fashion in the 1620s, the pace of change picked up in the 1780s with increased publication of French engravings illustrating the latest Paris styles. By 1800, all Western Europeans were dressing alike (or thought they were); local variation became first a sign of provincial culture and later a badge of the conservative peasant.

Although tailors and dressmakers were no doubt responsible for many innovations, and the textile industry certainly led many trends, the history of fashion design is normally understood to date from 1858 when the English-born Charles Frederick Worth opened the first true haute couture house in Paris. The Haute house was the name established by government for the fashion houses that met the standards of industry. These fashion houses have to adhere to standards such as keeping at least twenty employees engaged in making the clothes, showing two collections per year at fashion shows, and presenting a certain number of patterns to costumers. Since then, the idea of the fashion designer as a celebrity in his or her own right has become increasingly dominant.

The idea of unisex dressing originated in the 1960s when designers such as Pierre Cardin and Rudi Gernreich created garments, such as stretch jersey tunics or leggings, meant to be worn by both males and females. The impact of unisex expands more broadly to encompass various themes in fashion including androgyny, mass-market retail, and conceptual clothing. The fashion trends of the 1970s, such as sheepskin jackets, flight jackets, duffel coats, and unstructured clothing influenced men to attend social gatherings without a tuxedo jacket and to accessorize in new ways. Some men's styles blended the sensuality and expressiveness despite the conservative trend, the growing gay-rights movement and an emphasis on youth allowed for a new freedom to experiment with style, fabrics such as wool crepe, which had previously been associated with women's attire was used by designers when creating male clothing.

The four major current fashion capitals are acknowledged to be Paris, Milan, New York City, and London, which are all headquarters to the greatest fashion companies and are renowned for their major influence on global fashion. Fashion weeks are held in these cities, where designers exhibit their new clothing collections to audiences. A succession of major designers such as Coco Chanel and Yves Saint-Laurent have kept Paris as the center most watched by the rest of the world, although haute couture is now subsidized by the sale of ready-to-wear collections and perfume using the same branding.

Modern Westerners have a wide number of choices available in the selection of their clothes. What a person chooses to wear can reflect his or her personality or interests. When people who have high cultural status start to wear new or different clothes, a fashion trend may start. People who like or respect these people become influenced by their personal style and begin wearing similarly styled clothes. Fashions may vary considerably within a society according to age, social class, generation, occupation, and geography and may also vary over time. If an older person dresses according to the fashion young people use, he or she may look ridiculous in the eyes of both young and older people. The terms fashionista and fashion victim refer to someone who slavishly follows current fashions.

One can regard the system of sporting various fashions as a fashion language incorporating various fashion statements using a grammar of fashion. (Compare some of the work of Roland Barthes.)

In recent years, Asian fashion has become increasingly significant in local and global markets. Countries such as China, Japan, India, and Pakistan have traditionally had large textile industries, which have often been drawn upon by Western designers, but now Asian clothing styles are also gaining influence based on their own ideas.

The notion of global fashion industry is a product of the modern age. Prior to the mid-19th century, most clothing was custom-made. It was handmade for individuals, either as home production or on order from dressmakers and tailors. By the beginning of the 20th century—with the rise of new technologies such as the sewing machine, the rise of global capitalism and the development of the factory system of production, and the proliferation of retail outlets such as department stores—clothing had increasingly come to be mass-produced in standard sizes and sold at fixed prices.

Although the fashion industry developed first in Europe and America, as of 2017, it is an international and highly globalized industry, with clothing often designed in one country, manufactured in another, and sold worldwide. For example, an American fashion company might source fabric in China and have the clothes manufactured in Vietnam, finished in Italy, and shipped to a warehouse in the United States for distribution to retail outlets internationally. The fashion industry has long been one of the largest employers in the United States, and it remains so in the 21st century. However, U.S. employment declined considerably as production increasingly moved overseas, especially to China. Because data on the fashion industry typically are reported for national economies and expressed in terms of the industry's many separate sectors, aggregate figures for world production of textiles and clothing are difficult to obtain. However, by any measure, the clothing industry accounts for a significant share of world economic output. The fashion industry consists of four levels:

These levels consist of many separate but interdependent sectors. These sectors are Textile Design and Production, Fashion Design and Manufacturing, Fashion Retailing, Marketing and Merchandising, Fashion Shows, and Media and Marketing. Each sector is devoted to the goal of satisfying consumer demand for apparel under conditions that enable participants in the industry to operate at a profit.

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

Political influences

Not only did political events make a huge impact on fashion trends but also the political figure played a critical role in forecasting the fashion trend. For example, First Lady Jacqueline Kennedy was a fashionable icon of the early 1960s who led formal dressing trend. By wearing a Chanel suit, a structural Givenchy shift dress or a soft color Cassini coat with huge buttons, it created her elegant look and led a delicate trend.

Furthermore, political revolution also made much impact on the fashion trend. For example, during the 1960s the economy had become wealthier, divorce rate was increasing and government approved the birth control pill. This revolution inspired younger generation to rebellion. In 1964, the leg-baring miniskirt has become a major fashion trend of the 1960s. Gi