I’ve tried bespoke and men’s shirts:
Borelli; turnbull are both nice.
I also really like charvet , but I have not yet tried MtM or bespoke. They carry a women’s RTW shirt line. DH loves charvet MtM
Strongly recommend men’s shirting, even jf you need to have it darted, in terms of quality and price. I’m not crazy about cheaper men’s MtM options bc the fabrics are not as nice, but I haven’t really tried them.
I used to wear Ann Fontaine. I still like their structured vest/halter tops, but it’s no longer really my style.
ETA: forgot about white shirts with a bit of stretch: theory, Wolford, and years ago, dolce, etc. a different breed of shirt. If you like a lighter, less crispy, but more body hugging shirt, that might be a good option. Button placement is probably better for these shirts, but I think gaps are still an issue