Thanks Voltefarce for starting the T shirt chat and to everyone who made suggestions. I spent yesterday down a T shirt rabbit hole but managed to track down a few brands, both high and low end, who might offer necklines and colours to suit.
It got me thinking about life before the internet when I'd buy my T shirts from Gap, M&S and the Redoute catalogue, easy peasy. And, while they might not have been quite as great as I remember, there was no angst involved because there wasn't much choice anywhere else. And it was fine. Now I'm permanently dissatisfied because there's always the possibility that something better is just a click away. Maybe that's why I 'm reluctant to embrace Vinted and Ebay - because I suspect I'd either end up with a load of shit that I had to sell on, or spending my days searching for perfection and getting increasing grumpy.
Speaking of perfection (not) the Uniqlo U order went back. It wasn't bad actually but the men's cardigan failed the Kim Jong-un test and the gauchos were a nice shape but beige, not off white. (I've definitely been caught out by that before.)
However I may have ended my charity shop famine - found a heavy, relaxed fitting cashmere jumper, no label but feels more substantial than a high street brand, plus a Toast knitted linen top that will help with my quest to tone down my smarter clothes. So not a bad couple of days all in.