bikini skirt
A type of skirt (usually a miniskirt) that is actually the lower part of a bikini and which therefore also contains a bikini bottom. Usually this skirt will match the wearer's bikini top by its colors and/or patterns.
Not to be confused with the sarong, a separate garment enveloping the waist and legs, often found around a swimsuit.
See also
This tag implicates bikini (learn more).