There's this old propaganda that horizontal stripes make you look "fat," e.g. bad, and vertical stripes have the opposite effect, thinning, e.g. good. This is harmful rhetoric, as it encourages women to overprioritize looking thin.

It is true that the horizonal stripe dress accentuates the curves, whereas the vertical stripes diminish them. But the values ascribed to these features are ass-backward. Curvy is good! Love the horizontal stripes personally.