Well, look what happened on the way home from breakfast with a friend. I stopped into the consignment store, where I happened upon this PAUL SMITH summer jacket in...light blue check!
It is half linen, half summer weight wool. Unlined (apart from the sleeves and top area) but beautifully finished seams (of course!) It has bracelet sleeves with many working buttons and a slight flare to them. And it can be worn traditionally, or buttoned up higher for a sort of Nehru effect. It is hard to show in a selfie but it actually works.
Not styled or anything really -- just thrown on to show.
Best of all, got it for a pittance.