Coat with some "give" in the sleeves

[Adultchildofelderlyparents]

I'm looking for a new winter coat. I'm a size 16-18 (depending on the shop) but I have chunky upper arms. I've been looking and trying on, but I'm finding that coats which fit my body are too tight on the upper arms. Bigger sizes which are comfortable on the arms are then too big around the body and I don't want a baggy coat.
Has anyone seen coats recently that have a bit of "give" in the arms?

If you put ‘drop shoulder wide sleeve coat’ into Google a fair few come up. The drop shoulder seam always gives more room under the arms & arms and wider sleeve gives more room.

Maybe try something with raglan sleeves? Because of how these are set into the shoulders rather than the armhole there is more ease under the arm which might help around the bicep. They are also flattering, I find, if you are chunkier through shoulders/arm/bust because the shape is neater and by default shoulders always fit even if boobs/shoulders/arms are different sizes.
i bought a navy cotton car coat from M&S this autumn with raglan sleeves which I’m pleased with. Good quality materials and nicely cut. But not a winter coat I’m afraid - it’s just starting to get too thin for the weather.

Maybe something like this would work?

www.johnlewis.com/john-lewis-raglan-sleeve-coat/navy-herringbone/p6372587?