I posted this a while back when I first got the figure, but it bears repeating. The only problem with the fat suit that I can see is that it doesn't taper off well. They should have had it go up farther on the torso, and taper off to the neck. Because of the design there are big dips in the shirt like this:
You can see these in Fiends pics. As great as his poses are, the odd shape of the chest distracts:
Again, that's because the fat suit ends here:
A very easy fix is to put bits of cotton balls in the shirt like so:
Then when you button it back up, no more dents!
Since I did that, I haven't had to give any thought to futzing the shirt at all. It lays perfectly.
The only other spot where the fat suit is noticeable is where it ends near the knees. I have yet to mad that area, but I plan to use cotton there as well.