Khaki
Clean lines and smart color, a coat which almost thinks it’s a dress - is what you are looking for.
The spring coat needs to have contrast against your winter coat, it provides less warmth of course.
It is crafted from good, Khaki colored cotton fabric and is shaped to a wrap-around silhouette with a waterfall collar - clean and simple. Waist is wrapped around with lacquered belt. The coat also has side seam pockets.
Spring is a troublesome concept long. Long before it blooms into reality. In other words, you need a spring coat.