selfmade Skirt and Shirt problem

andreas-christoph_1daaba1d46

Hello everyone
I make my own clothes for Genesis 8 female for the first time.
Unfortunately I have the problem that when moving the skirt and the shirt under the arm have unsightly distortions.
Can someone help me? 
I tried to create the whole thing after the tutorials of Daz Studio .
Unfortunately, I am not going anywhere at this point.
a sample photo shows my problem.
Thank you very much for tips     Andreas

 

Gordig

Looks like they're not properly weight-mapped, in addition to probably needing some JCMs.

andreas-christoph_1daaba1d46

Thank you  for your help!

Leana

The skirt seems to have been weight mapped with transfer utility using the default projection template, which means it follows the legs. Skirts and dresses which are not skin-tight are typically rigged by adding custom bones used to manually pose the front, back, left and right parts of the skirt rather than follow the legs, as rigging them to follow the legs can lead to mesh stretching and unnatural poses.

Utilities like SY Ultra templates provide alternate templates specifically made to rig dresses.

 

As for the armpit problem, as Gordig said you will most probably need to create a correction morph meant to reduce distortion when the arm is raised.