Hello, that looks like the project I posted here:
Avatar Body Size Customization
Please note that the project was just a little wip, so it was tested with just two of the many skins and not all of them, for fun. This is also stated right below the download.
The long blue dress doesn't work well with the current short skin setup. It is possible to fix this by putting more work into tuning the short/long skins, maybe by adding more constraints to control the dress better for the short/tall skin, but it was beyond the scope of the test, so that test won't be fixed.
If you see it not working well in the editor, it will also not work well in Unity in this case.
Translation:
您好，看起来像我在这里发布的项目：
Avatar Body Size Customization
请注意，该项目只是一个小步骤，因此仅使用了许多皮肤中的两个进行了测试，但并非全部使用了它。 在下载下方也有说明。
蓝色长裙不适用于当前的短皮肤设置。 可以通过对短/长皮肤进行更多的调整来解决此问题，也许通过添加更多约束来更好地控制短/高皮肤的衣服，但这超出了测试的范围，因此测试不会 不固定。
如果您发现它在编辑器中无法正常工作，那么在这种情况下，它在Unity中也将无法正常工作。
