I have seen a number of coats that have been crocheted, some with Granny Squares, others with a combination of both Granny Squares and Afghan Designs, and I’m leaning towards the latter. The design I have in mind is for something that comes down to the knees and is nice and colourful.
One square I have in mind is a wonky square;
The large square I intend to put on the back panel is still in the drawing stage (not mine).
I also like a couple of these, perhaps on the front,
It’s still swirling around in my mind, may change, we’ll see, keep checking!