The 501 shrink-to-fit, button-fly jeans have undergone some radical changes. The pocket socks are shallower and the material thinner. The denim is not as heavy, and the once durable stitching is now a hit and miss operation. The structure of the 501 has changed. Gone are the engineered (7) traditional belt loops, which now number only (5). Only one back - centered belt loop exists now, leaving an 8-inch span between the belt loops on either side. Note pic. The black Levis are from 1997, and the blue Levis are from 2018.

postscript 4/3/2018 - The 501 shrinks pattern changed. If you use to wear 33 x 36 10-years ago, then you now need to order a size larger in the waist (34W) and shorter in the length (34L) in order for the 501's to fit. I did and their passable, but not exactly the same as yesteryear's.