bell-bottoms
Legwear, most commonly jeans, that widen at the bottom, typically starting at the knees. Also known as flares. When they widen from the ankles only, it may also be called a boot-cut.
They grew fashionable in the 1960s, and are associated with with a variety of fashion styles, including hippie and hip hop fashion.
Examples
See also
This tag implicates pants (learn more).