Wow, look at how well it fits your shoulders! I think it would go well with navy or maybe burgundy. What are you likely to be wearing at the time of year when you’d wear it? (Ie what temps will it be when it’s rainy?). Tights, pants, a scarf would all show and could be in colors you love.
Then again, this is about you caring about your appearance and building a style you love—foisting a coat in a color you don’t like onto yourself works against that goal. Maybe it could be your spare, or your darker one could be a little flashier or frillier or something than you’d usually get and you’d have this one for when that didn’t seem appropriate /didn’t match your mood.
As far as leather trims & such go on an item you already own, the harm has already been done, the money has already exchanged hands—you aren’t causing any further harm by wearing something you already have. You are reducing consumption. Sal phrased it brilliantly “the most sustainable wardrobe is the one you already own”.
While I’m being opinionated, I’ll also say that “I think he'll let me have it if....as its actually...” gets my hackles up. That could be why I’m single. That and a tendency to speak my mind when no one asked me to, lol.