Oatmeal is a light tan, like the color of khakis. Tin is a very light grey. The coat has a big v-neck collar... hard to explain but it forms a V shape with two large panels that sit on the shoulders/chest. It has a low neckline for a coat and leaves the neck exposed. It sort of reminds me of an enlarged blazer/jacket collar. The model is wearing a turtleneck in the picture. The length is mid-thigh on the model.
It's a nice coat, but I almost feel like it's not warm enough because of the exposure at the collar. It's a very simple silhouette, with no visible buttons, just a belt tie. I'm not sure if the coat would work without the belt. I suppose it would, but it would be even more simple that way.