A Dump Cover (aka parachute pants) are incredibly comfortable, loose fitting pants that come in stylish designs.
These types of pants initially became popular in the bodybuilding subculture in the 1980s.
Bodybuilders chose them for their outlandish style and extra leg room. You see, bodybuilders back then knew that you could be VERY serious about your training and style have a lot of fun along the way.
Lifting ain't that serious.