This is all a little frustrating. I’m big on polka dots at the moment. It has more versatility than paisley - it doesn’t dominate an outfit as much, but it still looks stylish and unusual compared to high street shirt fabrics.
Now I seem to have found the answer though.
I’ve discovered a load of fruity designs over at CXLondon.com. Controversially and despite the name, they’re actually based in Cambridge, but the retro online shop is a treasure trove for great shirts, especially unusual styles in polka dots. They’re made by Mr Free and a couple of others.