I spent a week trying to come up with a pattern for a nursing dress in my head, and then finally just set out sewing to see what I would come up with. I'm going to try to wear the dress today, to see how it actually works in practice.
The bodice comes up over the bust and then the shoulder straps come down over the shoulders (and over the bodice and cross to tie in the back around the waist. It should be quite easy to nurse discreetly in this dress without fumbling with buttons or straps or snaps, or untying anything (not that I usually end up nursing much when we're out and about, I get tired of those things even when we're around the house).
And after I decide whether or not I like it and whether or not it works I'll try to get better pictures of it. These were taken in a rather dim room with my computer (which obviously doesn't have a flash):