Cotton or cotton blend bralette/crop top

[Fidelius]

I’ve been trying to find a soft, comfortable bra without hook fastenings at the back, so a bralette or crop top.
The ones I’ve tried so far all have really thick and tight underbust bands, which even in a large size (and I’m a 36 A, so large is too big on the bust) feel like they’re much too constrictive.
Any ideas please?

M&S has tonnes of bralettes and sweaty Betty does a great low impact sports bra crop that my dd wears all the time

Know what you mean about the tight elastic.

Bamboo not cotton but very comfortable. You'd take a medium probably.
https://www.boody.co.uk/products/shaper-crop-bra-nude-6?collection_id=269291454510&collection_name=Crop+Bras