Attached Link: http://www.nerd3d.com/

Because dynamic clothes aren't conforming. You have to use them with the cloth room. Only conforming clothes will conform. You need to start by loading the figure in zero pose, then add the clothing. Then move to about frame 30 and pose the figure. Then into the cloth room and go through the calculation process. Nerd has a good tutorial on how to use dynamic clothing on his site (link attached.)

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire