This model has looked the same for 50 years, the most recent addition is a cell phone pocket.
Features
Fabric: 12 oz 100% cotton Tough Duck™
Lining, quilted 6 oz polyester insulation
Laydown corduroy collar
2 adjustable waist tabs
Brass zipper closure on chest pocket
2 lower welt pockets
Inside pocket with hook and loop closure and cell pocket
Adjustable shank button closure on cuff