I have one big purchase of the year left. I want some comfortable dress flats to wear at work.
-Not boots. I already have black heeled knee boots and ankle boots
- needs a high vamp or strap otherwise will not stay on. So no ballet flats or loafers
-Dark coloured
- needs to work with dresses and skirts
- not patent
-I like a one to 1.5 inch sturdy heel

I have found a few possible ones - links below. Doesn't have to be Mary Jane though, that is just what I have found so far.