>>297835614
vroid clothing is mostly texture work. Bunch of basic fitted skirts/shirts/pants with good uvs and adjustable sleeve lengths. The editor lets you draw directly on the model with a tablet so with clever use of alpha its enough for some people. Check booth for examples of vroid clothing:

https://booth.pm/en/search/vroid

If you want to do complex clothing and are familiar with modeling you should just scratch model it over the vroid base in blender or whatever.