A dark suit with a waistcoat shows several upper layers: light shirt, dark bow tie, buttoned waistcoat and an outer jacket with a more reflective lapel area. A pale pocket square sits at one side of the chest. The photograph ends near the upper legs, making it particularly useful for the distribution of layers and contrasts. It does not explain the actual materials or behaviour while seated. Full trousers and footwear must also be added before deciding on the complete outfit.
When using this as a consultation reference, name the leading preference first. Do you want a waistcoat, the dark lapel beside the light shirt or the small pale chest area? Compare the same shirt and neckwear on the actual outfit with and without a waistcoat. Sit, stand and open the jacket if you expect to do that later. Look without the jacket too. Decide which additional layer you need after those comparisons. A possible purchase then has a specific role, separate from the other accessories that may belong only to the photographed arrangement.