Understand what the coast actually asks of you
The Amalfi Coast is physically demanding in a way most people do not anticipate. Positano is built vertically, arriving means descending hundreds of steps and leaving means climbing them. Amalfi town has cobblestones that catch heels. Ravello sits 365 metres above the sea and the walk to the main square is steeper than it looks on the map.
What this means practically: your clothes need to be light, breathable, and entirely uncomplicated. Linen and cotton for the day. Silk for the evening, when the temperature drops just enough and the light turns gold. Nothing that needs constant adjusting, nothing that cannot survive a spritz of sea air, nothing that will look worse for an hour of exploring.
The good news is that the most practical fabrics for the Amalfi Coast, linen, cotton voile, silk, are also the most beautiful ones. The coast rewards the woman who dresses simply and well far more than the one who tries too hard.