How to create the effect that you can change some parts of clothes by draging parameters

Hjacob

I know some models of Daz are created bu Zbrush, and some parts of clothing models can be changed in shape by dragging parameters(like collar,chest,) in the bottom left corner, how can this be done, is this effect create by Zbrush fo some other software? Thanks!

Gordig

Those are morphs, which are copies of the geometry modified to achieve the desired effect. ZBrush is one way to achieve those, but any modeling program will work (Blender and Hexagon are free), or you could use Mesh Grabber or dFormers within DS.

magne.moe_2e4aaef724

These are build into the clothing by designer. 
Now the cloting also usually inherit your caracter morps so you can use this, find the breast morph on the clothing and make it a bit larger if you have clipping on a shirt. 
Zero morphs don't translate but adding -.1% to Ears Flat Morph you use this to flatten ears on hair behind elf like ears.  

I tend to use hexagon for basic stuff as you can simply push stuff to it modify the mesh and push back as an morph or new object.