Lee’s 101 is the brand’s oldest continuously produced jeans style.
Lee introduced the 101 line in 1925 as part of its workwear range. The style became closely associated with the company’s early denim reputation and has remained a reference point in Lee’s product history.
The number belongs to Lee’s model naming system, not to a year or a fabric weight. Over time, the 101 designation has appeared on different cuts and reproductions while retaining its historical connection to the original workwear jean.
Lee also produced other influential garments, including the 101J denim jacket and the 13-ounce cowboy jeans known as the 13MWZ. Those products are important Lee styles, but they are not the answer to the question about the oldest continuously produced jeans model.