Does black clothing make you look thinner?

Black is a very dark color that blends in easily with shadowing of your clothes making the shadows less apparent, making your appearance appear more as a flat silhoette instead of a 3 dimenstional. (by the shadowing I mean if you have 'rolls' it will blend it in with the rest)

and also black makes you look thinner bacause it is darker and harder to tell how bug something is unlike if you were wearing blue...

hope this helped