4 Buttons might be the way to go. As far as peacoat, I've got a decent one I like already, and I think that the cloth will just be too warm (if you can imagine that)...thats how heavy it was. I was actually using that cut as the model for this bespoke piece, but the fabrics too thick for the fly front, so I think exposed buttons would not jive with the sleekness of the rest of the coat. The cloth is this super heavy piece made in England in the early 1930s. Real unique, I think its up further in the thread.