The local posh frock shop often carries a range called God Save the Queen in summer, and they do those big bold patterns. I sometimes like them, but everything looked shit failed to flatter my bumps and lumps. The idea appeals even so, and I was once (25 years ago admittedly) fond of a Desuigal T-shirt. Stella Jean is gorgeous in a similar vein, but a bit spendy even when I feel extravagant.
I agree with you bani on pockets in cardigans; I use them and they sag instantly, but there's the same shape without pockets which would be better -- just not sure whether that colour is available, and it would be a very useful colour for my wardrobe.
For Pigeon, I came across a good shirt site (the Foldery?) which had some usefully plain shirts but silk rather than cotton.
Sadly, Flo, you are completely right: Smedley and Brora would be similar in price. Arket had some, and a green alpaca spent time in my basket for a while, but it was a bit too pastel. M&S men's cardies are pretty good, but the sleeves are always way way too long. Why can't womenswear deliver? They had an acid yellow that I nearly bought 18 months ago, but I decided to wait for the sale, thinking it wouldn't suit anyone else and I'd get it cheap.... wrong, again.