Lol! I have so many stupid questions about winter wear you don't even know. Just be glad I'm only dealing with the (very) occasional rain storm here, lol.
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If it makes you feel better to wear the green coat, get it. But I wouldn't look twice if you were wearing a black coat with brown boots in nasty weather. Sometimes it has to be about practicality.
Neutrals are mixed all the time these days. I have actually read that it's more trendy to mix them, no idea if this is a true fashion "rule". I think it's perfectly fine. Also fine to buy the coat in a different color. Costco outerwear is so cheap you'll still be coming out ahead of shopping elsewhere. I also have had BIG regrets from not stocking up on favorite costco items. (As me how many knockoff barefoot dreams sweaters I own from costco. Ummm I have definitely purchased 6....and I think I own 4 currently.)