I have two Montrose doublets and can tell you the good ( dashing) and the bad ( generally tailored in a way that is contrary to big stomachs.) I am in the process of having a third one made.

When I was young and foolish ( as opposed to old and foolish) I bought a black piper's jacket with silver trim. I thought it would make a nice formal jacket and it did, if you like wearing a bandsman's jacket to civilian events. But that got me used to wearing a jabot. Actually, I tried wearing the piper's doublet opened two buttons and wearing a bow tie, which ALMOST works, but not really. The jabot is the way to go.

Anyway, having sweated through a ball in that melton cloth piper's jacket, I was much better able to tolerate the still fairly warm wool flannel Montrose I bought next. It is bottle green and always attracts favorable comments. My downfall came when I purchased a (used ) black velvet one. It is a thing of beauty, but the waist of the jacket misses encircling my own waist by about 6 inches. Thus my adventure now in custom tailoring of doublets.

The Folkwear pattern called a Belgian Chef's coat looks to me as if it would make a great Montrose, but I am working from one made by McCall's, I think, that is actually for Civil War Uniform replicas. My seamstress is circling it warily and has yet to actually cut the medium blue velvet I bought on eBay.

Here is my argument AGAINST the Sheriffmuir: The way it is cut does accommodate a bigger tum, but I believe it also accentuates said gut in a way that some of us would rather avoid. The waistcoat may or may not be cooler with an open doublet than a buttoned up doublet alone. I doubt it.