Bell-bottoms

Bell-bottoms are trousers that become wider from the knees downward; they tend to have a "bell-shaped" look at the bottom of the jeans, which is where the name of the pant style comes from. Related styles include flare, loon pants and boot-cut/leg trousers.

Read more about Bell-bottoms:  Naval Origins, Bell-bottoms in The 1960s, 1970s, and Early 1980s, Flare and Boot-cut Jeans in The Late 1980s, and 1990s