@DoDoDoD , the models tend to be tall and willowy and almost flat chested. Clothes are often pinned or bulldog-clipped to look better in photos. Some sites have photos that have been photoshopped
If you are short(ish), you need to draw the eye upward. Midi hems draw the eye downwards, as do V-necks. Volume usually makes things look wider. Gathers, pleats and ruching adds bulk.
The NC green dress will add width to your shoulders, arms and bust, and to your bottom, it will make you look shorter. Even the model looks like a little girl trying on her mum's dress.
If you look at what people in the public eye wear, some have a definite look that they stick to.