HI Bluemoon 
The first thing I’m noticing are the shoulders which look kind of strange, but perhaps that’s just the way that outfit is.
then the chest, which looks a bit big,. I think there’s room for some reduction there, to eliminate poke through.
the shaders also look a bit shiny, ...try lowering the Highlight , and/or the shininess.
For most Clothing items where you have poke through, there are a couple of standard options,..
1,/ Check the clothing item for any adjustment morphs.
2./ Hide the underlying figure part, if possible.
3,. Use a magnet deformer to Push or pull the mesh to adjust for poke-through
In Carrara 8 pro, you have the option of editing the Vertex model, in the modeller, in animation mode, ...or directly in the Scene.
this can allow you to select a Morph area,. and add a new morph target, which you can adjust to fix the poke through.
One tip,..
In Carrara, if you have a figure or object in the scene, and you drag it from the instance list on the right, into your My Objects, in the browser,.. Carrara will save the object at the position it was in.
So,. If you create a new scene, and drag that saved object back in, it’ll be in the same position it was when you saved it..
You can also use the same method to save any component of a scene,.. such as the (fake GI) lighting group from that scene,.
it should be easy for you to select the objects you’re working on, and Group them, then drag that whole group to the browser, so that you can work in a new simplified scene, faster,.. and then,.. drag it into your main scene once you’ve worked through the posing, poke-through, and shader issues.
lastly,.. using a Beta version, for any work which you aren’t prepared to mess up. isn’t something I’d normally do.
Use the Carrara 8 official release. 
Hope it helps 