I have sent you the project. He looks OK in both T and A poses. But as I mentioned there are other poses, which do not look that good. So some more work might require.
And yes, the original project does crash when trying to export out of CC to FBX. The one I have sent is OK for the export.
I did not try physics on the robe.

75% of original size (was 667x19) - Click to enlarge


Just couple of notes about exporting out of CC and Blender. In order to export clothed model out of CC and be able to bring it back, the export rest pose has to be a T-pose and it has to have cloth perfectly fit.
That was a reason I had to fix T-pose fit weights in CC (which was a real pain). Now that you have a good looking T-pose, the rest of the weight fixes can be done in Blender , which is a whole lot easier to deal with when it comes to weight paint.
You may export with Calibration clip, which would help fixing weights in different poses.