In this look:
Cold shoulder Shirt: Random Brand (similar here)
Shorts: Random Brand (similar here)
Prada (similar here)
As I mentioned, I'm doing a series illustrating how to wear all white in different way. Today's all white outfit is semi-formal-chic style, lightened up by orange accessories. Again, the trick of avoiding looking chubby in all white is all about proportion; the length of the top and bottom should be matching in the perfect balancing manner. If you're wearing quite heavy tops, you should avoid wearing an equally heavy bottom(you can always lighten it by shorten the length/choosing lighter fabrics).