Which term describes clothing styles that remain popular for an extended period?

The term that describes clothing styles which remain popular for an extended period is "classics." Classics are timeless fashion pieces that do not adhere to the rapidly changing trends or fleeting tastes of the fashion industry but instead maintain their appeal over time. They are often characterized by their versatility, quality, and ability to complement various styles and occasions. Items like a little black dress, tailored blazers, or denim jeans often fall into this category, as they can be worn in multiple settings and continue to be stylish season after season.

In contrast, trends represent styles that may be popular for a limited duration, changing frequently, while fads are short-lived phenomena that can quickly rise in popularity and then fade just as fast. Seasonal pieces are designed to be worn during specific times of the year and are often influenced by the current season's trends, rather than being perennial favorites like classics.