The image below is an example of very large breasts (beyond the normal range of the breast sliders) and the pattern across the breasts is still fairly uniform with no pincushion distortion. However, even after fixing that problem, there was an issue with any pattern or graphic on the shirt distorting in an unnatural way, so I've completely re-boned the shirt to eliminate this pincushion distortion and provide a more realistic and uniform stretching of the fabric across the breasts. These are default replacement meshes to fix this problem.
This is because there are some odd bone assignments around the bottom of the breasts that cause the shirt to deform in a strange way if the breasts are enlarged at all. If you use any of the available Breast Slider mods, you've probably noticed the T-Shirt looks very strange on your bustier sims. My version does appear tighter and somewhat bustier than the EA fixed version, for what it's worth.
This mod is no longer necessary as of patch 1.17/2.12/3.8/4.5/5.2 or if you have Late Night installed because EA has fixed the T-shirt meshes (among others).
