tube dress
Essentially a tubetop extended to dress length, a tube dress is a strapless close-fitting casual dress. Tube dresses generally reach from just past the hips to knee length, and they tend to fit snugly around the legs like a pencil skirt/dress.
As this tag is implicated to be strapless, do not use this tag if the dress has shoulder straps or halternecks; in such cases, the pencil dress tag could be used instead.
See also
This tag implicates strapless_dress (learn more).