A pale lilac base appears beneath lighter floral shapes in this photograph. The drawing concentrates on the bodice and extends into the upper skirt in several places. A narrow band marks the waist. Below it, a long light-looking outer layer spreads outwards. The base colour therefore remains more continuously visible across the skirt than across the upper section. This offers a useful relationship between a pale colour and a lighter patterned edge.
Look at a similar candidate without an additional veil first. Would you like the slight lilac direction to register clearly, or only to differ quietly from the pale motifs? Then try the veil behind it and briefly in front. Its large area may change the combination more than a small piece of jewellery.
Choose shoes according to how much colour you want to repeat below. A nearby pale shade can connect quietly, while a clearly different colour creates another accent. Compare both while walking and sitting. Use the real outfit for that decision; the screen image cannot specify an exact lilac shade or the complete effect of its outer layer.