School yourself on the history, study the terminology and shop every fit from the most storied brand in blue jeans.

Michael Murtaugh/NYT Wirecutter A classic straight-leg jean with an easier fit: Levi’s Premium 505 Regular Fit Selvedge Men’s Jeans. Michael Murtaugh/NYT Wirecutter A “Goldilocks” straight ...

In the beginning, there was one: the 501. Over the past century and a half, Levi’s jeans have become a favorite of miners, laborers, rock stars, fashion designers and practically everyone in-between.