Why is is that about 2/3rds the time, when I see Usagi in a white dress... 2 thoughts immeditaly come to mind.
1. I think that it makes her look fat.
2. And fashion wise, a lot of the white dresses I've seen her in look dreadful to me.
This is around 2/3rds the time, not every time. But it is a large consistent statistic.