I made this. It's awesome.
The Mackinaw Coat by DbCA (Designs by Call Ajaire) is truly a labor of love, time consuming and awe inspiring. The bound buttonholes are (though not perfect) a masterpiece - these were my second attempt, when the "aha!" moment came and I finally understood how they worked!
And if you're one of those pro people who can sew a bagged lining and bound buttonholes in your sleep, then all the more reason that you need the Mackinaw - you'll have a cute new coat for your little love in no time! ;)