The utility model relates a women fitting shape underwear. The underwear wall is embedded with the thickness increasing cloth belt. A cloth belt channel sleeve is equipped in the underwear wall. One end of the cloth belt channel sleeve is the closing end and the other is the opening end. A thickness increasing cloth belt is embedded in the cloth belt channel sleeve, one end fixed at the closing end of the cloth belt channel sleeve, the other end equipped with the agraffe. The thickness increasing cloth belt may free move in the cloth belt channel sleeve. An agraffe fixation sheet is equipped outside the opening end of the cloth belt channel sleeve. Rows of agraffe rings are equipped at the agraffe fixation sheet. The underwear with the flexible cloth belt structure can be the coat, trouser or integral garment. After wearing the underwear, using the hand to pull the thickness increasing cloth belt is sufficient to let the agraffer to hook one row of agraffe ring at the agraffe fixation sheet so as to tension the back or lift the buttocks in accordance with the stature and movement status of the wearer for the final purpose of fitting.