tied shirt
A shirt tied together at the bottom, usually so that the midriff is exposed.
Common examples include tying the tails of button-up dress shirt together in front, often just below the breasts, or tying the bottom of a t-shirt around itself to show off the midriff.
This is not for a shirt's sleeves being tied shut individually or together. For that, see sleeve tied shut, sleeves tied together, or clothes around waist.
Examples
See also
This tag implicates shirt (learn more).