According to the related information of official website in QQ Hyun Dance, we know that you need to choose a suit or upper body in your backpack to grow taller. Click on "Grow taller" in the upper right corner and be sure to use the growth stamp. Note that this operation is irrevocable.

QQ Hyun Dance is an online multiplayer 3D interface music and dance game launched in 2008, which emphasizes leisure, fashion and making friends. It was jointly built by Tencent and Beijing Yonghang Technology.