The jacket seems to have the main purpose of showing her apparently enhanced chest. One of the pictures on this link offers a comparison:
The princess and the plastic: Kate Middleton? - In Your Face - The Orange County Register
Same site also shows she does her eyeliner different - in one photo, where it's applied above the lash, it looks much better. But she needs to get a push brush and a good powder liner and learn to make that eyeliner more subtle, it's really unbecoming. Her weight and skin issues may be related.
More than anything, I hope she takes care of her health. She's had quite a bit of time to get used to the stress of a public position, although the next few months are going to take their toll. I was surprised to read how adamant so many people are (on the duties thread) that she should have "duties." I think perhaps she should take care of herself and her new husband, as her first priority.