A sarashi that is too small to adequately cover the torso, resulting in the character's chest/breasts or midriff being exposed.
To qualify for this tag, the sarashi wrappings should be reasonably secured tightly on the torso; in other words, it shouldn't be too loosened or mostly unwrapped, otherwise it is an undone sarashi instead.
For female characters, a budget sarashi often takes on the form of very narrow bands of cloth wrapped around the torso that minimally covers their breasts, often resulting in hefty exposure of cleavage and underboob.
This tag implicates sarashi (learn more).