What is a "crop top"? A crop top is a type of shirt that is cut off above or at the midriff, exposing the belly button and part of the stomach.A crop top is a very short, usually tight, top worn by a girl or a woman. One pair of jeans was styled with a transparent crop top dripping with crystals.A crop top is a very short, usually tight, top worn by a girl or a woman. One pair of jeans was styled with a transparent crop top dripping with crystals.A crop top (also half shirt, midriff top, belly shirt or cutoff shirt) is a top that reveals and exposes the waist, navel, or abdomen.