一个网站给出了几点原因。

1. The expiration of a patent held by Levi’s in 1908 led to an influx of imitation jeans flooding the market.

1. 1908年李维斯专利到期导致高仿牛仔裤大量涌入市场。

2. The romanticization of the “cowboy lifestyle” made jeans popular.

2.“牛仔生活方式”的浪漫化使牛仔裤流行起来。

3. A third thing that helped denim jeans become popular, particularly overseas, was their popularity with servicemen in the 1940s and 1950s, who often liked to wear them when they were off duty.

3. 牛仔裤流行起来（尤其是在海外）的第三个原因，就是20世纪四五十年代牛仔裤在技工中广受欢迎，他们不上班时也经常喜欢穿。

4. And finally, the fourth thing that made jeans popular with the younger generation was the release of films like Rebel Without a Cause and The Wild One, in which the protagonists wore jeans as a way of rebelling against societal expectations. In the 1980s, interest in jeans went nuclear with the release of a series of sexually charged, strong armed ads.

4. 最后，第四个原因，牛仔裤受到年轻人欢迎的原因，是电影《无因的叛逆》和《飞车党》的上映，影片的主角都穿牛仔裤，以显示对社会期望的反抗。到了80年代，随着一系列充斥着色情和暴力的广告的播出，人们穿牛仔裤的热情空前高涨。

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