i'm having an odd little problem with conforming cloths in poser. i would like to fix it, but i don't know what is even causing the problem. help please?

That looks like the mesh tearing. Check your joint zones.

Looks a little bit like unwelded verts.

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This often comes from a missed weld.  Check your CR2 file and be sure
the 'rCollar' is welded to the 'Chest'.

There should be a pair of lines like

        weld rCollar
            chest

and

        weld lCollar
            chest

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it is most likely what was said above but ...

it happens to me when poser runs to long (has nothing to do with cr2) - probably something gets wrong inside memory and such breaks randomly appear on the figures - restart usually helps.

ok Thank you everyone!

 Remember that all the collar bits must be a child of the chest bit. You can't have some of them welded to the chest and some to the abdomen for instance. That might be what's wrong here :)

The HIP is the only body part that can have more than one "child" part.

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ok Thanks you! will try to Remember!

Re-starting didn't work, and i'm not exactly that learned in poser yet, to understand it all. does anyone have a tutorial that might explain how to fix it? seeing as i'm rather new at all this?