This is Old Navy's Belted Trench (item #633439), which is alpha-sized, and was available in a number of colors, including this khaki (above), black, and this fuchsia-y color (below). This trench retails for $49.50. Old Navy describes the coat as such:
Classic, confident and eternally cool, the trench coat exudes a mystique that still feels modern. Smooth brushed twill, an eight-button double-breasted front and tie belt add signature style to any outfit.
The coat has a classically trench appearance - double-breasted with a waist defining self-tie. I picked this up in my regular Old Navy top size, and it fits perfectly. It has slightly off-seam pockets that button closed. The coat falls about mid-to-lower thigh for me, which I think is a nice length for a spring coat.
Here is how the coat looks when it's not buttoned or tied.
Overall, I love this coat. I wear it pretty much every single day now that spring seems to have finally asserted itself over winter. It's soft, fits well without looking too mature, and I love the fun color.