This is pretty much what I had in mind when I bought my peacoat earlier this year. A simple, classic way to wear a peacoat and stay comfortably warm even in a bit colder climate. It has also become a look I tend to go for without thinking when I'm in a hurry and being casual isn't a problem.
The items this particular time include my navy SuitSupply peacoat, a heavy burdungy crewneck knit, raw denim and a wool hat from Nollakolme Tampere, Equus Leather bridle leather belt, Berg & Berg red wool socks and Meermin longwing gunboats.
To keep things simple, I had a simple white button-down shirt underneath. I'm extremely happy with how the reds, the navy wool hat and the denim work with the peacoat. Combined with the medium dark leather in the belt and the shoes it just works like a charm. One of those fail-safe combinations as well, can't really go wrong with this one.
The belt is in Australian Nut, a perfect fit for my Meermins. I have a few new belts coming up from Equus Leather, and still thinking of getting one wider one to go with the rougher and more streetwear combinations.
And last but not the least, the shoes. In my opinion, longwing gunboats with heavy rubber soles (or double leather if there's no snow) are great option to be worn like this. They have that ruggedness needed and work well together with dark denim.
The small details such as the socks or the wool hat in their thick wool and lively textures add depth to the overall result. This is also the kind of outfit that you can easily use very often and still keep it feeling fresh by rotating the secondary colors or perhaps jumping into casual chinos instead of jeans. My favorite of the season to visit the grocery store for sure.