You guys rise to the occasion! The consensus is overwhelmingly in favour of a coat.
I am going to use Butterick B5145 and one of the longer views like C or D (pink or blue), with the regular collar. I will cut out the tabs for the back and sleeves, even if I'm not sure if I will use them yet.
I am not sure how long a skirt I can get out of the fabric I have but I'll try for about knee-length. I am also not sure if I will put more than the three buttons down the front part of the bodice. In a wind, the skirt will fly open if it is not buttoned down. When it's 20 below, that is a big deal. But since this is only a Spring coat, we're not talking 20 velow.
I was hoping to make the cutting easier by folding the fabric in half but when I did that, the selvages didn't match up, even though I carefully folded the fabric along a particular white line. This means I will have to cut each piece out of a single layer of fabric. sigh.