We all know things like shapewear can help slim you out and get rid of lumps and bumps when wearing dresses, but there are design elements you can use to help too!
Vertical Prints will make you look narrower
A Wrap Style like the one below adds shape to a midsection and creates curves where you want them
Vertical Colour Blocking moves the eyes up and down, creating an overall slimming effect.
Vertical piping and seaming do the same.