answer:One reason people recommend wearing black to “look thinner” is because people are less likely to notice shadows in the fabric, which will give you the illusion of having a crisper silhouette. However, throwing on a black frock isn’t going to magically make anyone look skinny. Wearing clothing that fits is a better way to feel more confident (nothing too tight or too loose.) Do I feel skinner when I wear black clothing? Depends on the garment. Some materials make me scratch my head and wonder why I wasted my money and others make me feel quite svelte :) Same with all the clothes in my closet, really.