Waterproof coat for big bust

[Cydonia]

Sorry, another waterproof coat thread! I need to replace my current autumn/winter waterproof and looking for a parka type style as opposed to a hiking type jacket.
I’m short with short arms but big on top - size 16 due to GG cup boobs - and 12/14 elsewhere.
I’m struggling to find a coat that fastens over my chest without squashing that I can wear a jumper under but that doesn’t swamp me! I have a tendency to look like a child in an oversized school coat if I’m not careful!
So I’m looking for something that will fit my chest in, but not too oversized. I like the look of Didriksons, but there’s so many styles I’m not sure which would be best. Or if that brand would suit, as I have an old one ( size 40 ) that I can no longer fasten.
I bought an insulated long coat from Finisterre last year that was very generously sized ( ended up with a size 12!) but I’m not sure if the waterproofs would be the same as they tend to be more fitted.
Any tips greatly appreciated!

Seasalt do have some waterproof jackets in petite. I have the same problem as you and have found these okish if I size up (but choose petite). I wish there was more choice because its annoying and unflattering to be drowned by long sleeves, oversized shoulders etc but still have your boobs flattened by lack of space in the right place!

Have you discounted a dry robe (not necessarily that make)?

I bought one a couple of years ago for using on the beach in the autumn, but I use it far more often as a winter coat. It’s wonderful warm and very waterproof (mine is 15k), but obviously is oversized so perhaps not the sort of style you want.

Thanks for the replies. I’d forgotten about Seasalt and didn’t know they did petite so that’s worth a look.
I agree a dry robe is a roomy choice, but for now I’m after something a bit smarter.