Last year I bought a Matalan boyfriend coat (but it wasn't cold enough for me to wear) so unworn as yet.
I bought DD a Matalan navy parka which she loves and they are in the shops again this year (though I don't think they ever go out of fashion). I prefer the khaki, but she got the navy for school.
If you want something online, QVC do loads of Centigrade (usually down filled/fibre filled ) their own brand. I've had a few, I get bored of them before they wear out. They do Dennis Basso too if you Like That Sort Of Thing......................(faux fur. He's a furrier by trade)
This year , there's a thing for blazers, soft jersey type , but they don't suit me . I'm going to try a Boyfriend Blazer, longer and less fitted. Might be ok, might be yuk
Primark had some really nice ,simple camel 'wool' coats, hidden press studs not buttons about £28. I had to try a 12 (I'm a 16) to find one that vaguely fit but even that felt baggy.
And some sheepskin type or fluffy white coats but that's a "No" fro me.