According to the lightness illusion, light colors expand objects, while dark colors narrow them.
From an evolutionary perspective, this feature of our vision is useful because it allows us to see objects better in the dark, such as predators at night.
Light hair can make you appear shorter
Research has found that light hair color can visually reduce body height, blur facial features, and make shoulders and neck appear wider. In contrast, black hair slims and emphasizes contours.1
Darker clothing slims the body
Brighter clothing attracts attention
Use clothing details in bright and colorful colors to grab attention to desired parts of the body.
As main colors, they are less suitable. In clothing of a saturated color, you will appear more larger.4 Moreover, observers will scrutinize your outfit more carefully, which can lead to a shift in focus towards less important details and lower the eye line. It is better to choose something darker.
Koutsoumpis, A., Economou, E., & van der Burg, E. (2021). Helmholtz Versus Haute Couture: How Horizontal Stripes and Dark Clothes Make You Look Thinner. Perception, 50(9), 741–756. https://doi.org/10.1177/03010066211038158 ↩
K. Martynov, K. Garimella and R. West, Darks and Stripes: Effects of Clothing on Weight Perception, in Journal of Social Computing, vol. 1, no. 1, pp. 53-70, September 2020, doi: 10.23919/JSC.2020.0006. ↩