Levi Strauss & Company 505 jeans came along after the zipper was invented in 1893. The 505 line has all the varieties of the 501 line of jeans, including the five-pocket standard, except for the button-fly front. Instead they were designed with the zipper-fly front.

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Levi's 505 jeans sit at the waist, feature a zipper fly, have a straight leg, and also offer a comfy, roomy fit. Levi's 505 jeans and 501 jeans have a similar fit below the knee, however, the 505 style is roomier through the thigh, while the 501 style is more fitted.
So now, as an homage to the company's legacy, all Levi's fits are denoted by a number: 501, 505 and 511, among others. Each number denotes a cut designed for a specific style and body type. Throughout the 20th century, Levi's also made jeans outside of the 500 series.
A minor but crucial detail: the 501s feature a classic button fly, while the 505s opt for a zip fly. What's the Deal with Levi's 501? The 501s are Levi's "OG fit jeans"—regular fit around the seat and thigh, straight cut from knee to ankle, and a button fly to boot. They're what you'd call your classic, 5-pocket, straight-leg jeans. . 86 166 152 409 173 439 49 491

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