00501 Levi's Men's 501 Original Fit Jeans The blue jean that started it all. Levi's button-fly 501 Original Jean is still straight through the seat, thigh and leg, a bestseller for its one-of-a-kind fit. The tilted waistband pitches toward the front. Finishes have been hand treated and washed down to give them a soft and comfortable feel. Wear it true to size or size it up for a looser look. 100% Cotton.