Whatever your body type (I'm guessing you will be a Rectangle or fall just over the line into IT) you have a super-fit looking shape! Very kick-arse now/take names later.
If you read Angie's recs you'll see you have many options for dress shapes, but as a hip-challenged sort myself I find more pronounced A lines often droop sadly without roundness to fill them out, but very mild ones will work.
Sheaths will underscore straight lines, which is fine if that's your goal, but when I wear them I will usually try to push my silhouette to a more rounded one by pairing them with a jacket/top that creates a defined waist.
For necklines I usually buy (or have altered to) V or scoopnecks -- otherwise I feel very block-on-block.
[The wider-set the V or U the broader your shoulders will look, so you may want to keep an eye on that and go for straps/Us/Vs that sit closer to your neck.]
Did you say you were short-waisted in another thread? If so, I avoid natural-waist dresses like the plague -- empire or no-waisted only pls thx!
Maybe try a shirtdress with a slightly flared skirt? Seems like it would fit your rather tailored style and could be funk'd up/down depending on fabric and/or color.
ps Dresses with tulip/tapered skirts (draped!!) will amp up the hourglass factor.