Summer Drape Collar Jackets
I bought this jacket from Veronika Maine. It is perfect. Light weight. Great cut. Works with everything. Flatters my swimmer shoulders.
Some other examples of versatile, flattering waterfall jackets.
This leather jacket from Warehouse is tempting:
This cardigan from The White Company is half cotton, so should be OK for summer:
This Wish Proxy blazer is a classic: