A quick refresher on how to add or subtract pounds/kilos visually
Light colors make you look larger. Darker colors make you look smaller. Use them to call attention to areas you want to highlight or minimize.
Garments that are boxy and shapeless add weight, though we tend to hope they disguise extra pounds. Longer lengths, such as a jacket that falls below the hips, elongate your silhouette.
Avoid squeezing into anything too tight. One size up will be more comfortable as well as more flattering. If you want to add curves this principle still applies; too-tight clothing will only emphasize your shape.
It’s no surprise that thick, bulky fabrics (I’m looking at you, teddy bear coats!) add literal inches.
Single-breasted jackets have less fabric around the mid-section than double-breasted ones do. And the additional buttons on a double-breasted style call attention to the bust and belly, especially if they’re metallic.
VERTICAL vs HORIZONTAL
Vertical lines elongate; horizontals widen. This is not just about actual stripes; a contrast-color belt creates a horizontal, as does an outfit with multiple hem lengths. If you love horizontal stripes, as I do, add a long solid-color cardigan to minimize the pattern and create a vertical line.
For the leanest look, stay within one color palette (including shoes) and add visual interest and/or color with jewelry or a scarf near the face.