Low-rise jeans, worn by both men and women, are jeans

Jeans

Jeans are trousers made from denim. Some of the earliest American blue jeans were made by Jacob Davis, Calvin Rogers, and Levi Strauss in 1873. Starting in the 1950s, jeans, originally designed for cowboys, became popular among teenagers. Historic brands include Levi's, Lee, and Wrangler...

 intended to sit low

Low-rise (fashion)

Low-rise is a style of clothing, designed to sit low on, or below, the hips. The style can also be called lowcut, hipster, or hip-hugger. A normal Low-rise sits at least 2 to 3 inches [5–8 cms] below the navel...

 on, or below, the hips

Hip (anatomy)

In vertebrate anatomy, hip refer to either an anatomical region or a joint.The hip region is located lateral to the gluteal region , inferior to the iliac crest, and overlying the greater trochanter of the femur, or "thigh bone"...

. They are also called lowcut jeans, hipsters, hip-huggers and lowriders. Usually they sit at least 8 centimetres (3 inches) lower than the belly button. Low-rise jeans have existed since the 1960s, but regained popularity in the 1990s and 2000s.
The "rise" of any jeans is determined by the distance between the crotch

Crotch

The term crotch may be used to describe the region of an object where it splits into two or more limbs. This can include trees, animals, buildings, in wiring diagrams, etc....

 and the waist

Waist

The waist is the part of the abdomen between the rib cage and hips. On proportionate people, the waist is the narrowest part of the torso....

 and is usually around 30 cm (12 inches) on regular pants

Trousers

Trousers are an item of clothing worn on the lower part of the body from the waist to the ankles, covering both legs separately...

.