Crop tops are T-shirts, tank tops or blouses that are cut short below the chest area, resulting in the exposure of some of the wearer's abdomen or midriff, sometimes even revealing underboob.
A crop top and crop top overhang are frequently signature elements in the outfit of the Shimakaze (Kantai Collection) character. The same applies to the Ryuuko Matoi character from Kill La Kill.
source: danbooru wiki
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