I often hear some big-size girls say: "She has plump breasts, plump buttocks, and thick thighs, so it is important for them to find a suitable, beautiful and comfortable big-size underwear."
I have also heard some experiences of two girls about buying large-size underwear. Two large-size girls of the same weight bought the same size, but when they tried them on, the effect was different. Maybe it suits one of them. Because even though they are the same weight, they may have different heights or different body shapes, some are apple-shaped, and some are pear-shaped. It may be that these reasons make the underwear not suitable for her, and she feels very uncomfortable when wearing it. She even spends a lot of time every day adjusting it, it is inappropriate results.