I found this photo on the Vintage Fashion Archive Facebook page. I am especially interested in the dress on the left.
That looks like it would be easy to copy. I might already have a pattern or patterns that would work. Things I would change: 1. Eliminate the seam down the front. 2. The bodice is a little too blousy. I think those might not be actual princess seams, just trim, so I would make an actual princess seam bodice. (Are you starting to see what attracted me to this dress?) 3. A more fun color, likely a print - a tiny floral or geometric print or maybe pin dots.
Also, I'm not sure about the sleeves. I wear dresses mostly in the summer and tend to not wear anything with sleeves very often - in fact almost never. But I'm not sure how this would look without sleeves. I'm having difficulty picturing it. So maybe a winter dress with long sleeves. But, again, I mostly wear dresses in the summer, rarely in the winter, so I'm afraid it would end up being one of those dresses I only wear to funerals, unless I made it in a color or print that would be totally inappropriate, in which case I might never wear it, and both of those scenarios make me sad.
So anyway... those are just some early thoughts. What do you think?