There is a great diversity of offers for this category of products: we find for example the coat, the 3/4, the overcoat, the polo coat, the Chesterfield...
Each piece would almost require an article, but let's go through the main lines together.
THE COMFORTER
It's hard to find a nice down jacket that doesn't ruin your style... You quickly look like you've put a (garbage?) bag over you... It can look very cheap.
ugly black down jacket
In another case with a use of natural material and a care given to the style, there is the down jacket in wool flannel and cashmere De Fursac:
De Fursac down jacket
Perfect example of a successful piece.
Or this very nice model with herringbone at Carven.
carven down jacket 
THE PARKA
Beware of the parka, it is a garment more in tune with the mid-season than the full winter. Initially the parka is made to protect from rain and wind. It is the k-way of the fall.
In rainy weather I prefer the trench coat because it is much more interesting from an aesthetic point of view. There are few that you can wear in winter - the only notable exception is wool trench coats.
By the way, you don't need cold weather armor that you could use in the Arctic either...
Canada goose parka man
Parka of the brand Canada Goose. We see a lot of them in Paris and believe me, it is absolutely not adapted to this use...
stylish parka man
The most stylish parka I could find so far! Papy is always in the shot Very nice layering in addition to the contrast of style!
Lacoste Man Parka
Lacoste men's parka (reversible)
THE CHESTERFIELD
It was the Earl of Chesterfield who first wore this overcoat in London during the 19th century. The cut, typical of the frock coat at the waist, was no longer horizontal but simply absent. Causing a real scandal at the time, the coat has not evolved much.
An elegant overcoat to be worn over one's professional or evening clothes. Normally made from a soft precious fabric, often a mixture of wool with cashmere or even pure cashmere, in classic shades of gray or very dark shades of blue.
WHAT COLOR FOR YOUR COAT
If this is your first winter coat purchase, I recommend starting with three possible colors that are easy to use and versatile.
A blue coat, a gray coat or a camel/sand coat
simple coat
From there, there is little chance of making a mistake.
On the contrary, if you already have 2 or 3 coats, you can allow yourself more freedom in your choice.
Little used colors or patterns, it will depend on your desires:
orange double-breasted coat for men
A coat (Burberry) that combines both color and texture!
gucci coat
Gucci coat, in a white color, which is unusual
burberry herringbone coat
Classic. A double-breasted herringbone and sharp lapels. Get out of the monochrome while remaining versatile.
Prince of Wales Double Breasted Coat
Always classic, a brown Prince of Wales to change the gray
Coat man Zadig and Voltaire
Black Zadig & Voltaire coat (red decorative stripes applied below the collar)
STRAIGHT OR DOUBLE-BREASTED COAT ?
This choice will greatly influence the overall look of the outfit. And will depend on what you want. One with more presence, the other with more minimalism.
The crossed shape comes from the military wardrobe. Indeed, the advantage of this closure is that it is warmer at the bust level (belly and chest) simply because two layers of fabric are superimposed.
The crossed shape adds horizontality to the outfit and can therefore give an impression of additional width at the bust. It is more imposing. This can be useful for someone who is very thin.
The straight coat is also very elegant and meets the departure of a city wear. It is largely more minimalist than the double-breasted. You will find few straight coats with epaulets, martingale etc... Typically military details.
It is very vertical and will sling the little ones upwards; however, be careful that it is perfectly fitted and that the sleeves also fit well, so as not to compress the silhouette:
