Peri, I nixed all those WHBM dresses without even trying them on. I just don't have the hips to carry any of those off.
If you are an apple like me, I look for sheath dresses that have no defined waist. I just checked AT as they are the source of many of my favorite sheath dresses, but all the sheaths they have online right now have set-in waistbands. Check back frequently as they nearly always have one or two styles like this.
There are lots of dresses out there that have no defined waist but add waist definition by the way they are cut at the sides - gracefully inward at the waist and out again at the hips -- rather than straight down. But without elastic or set-in waistband.
My other favorite dress shape is one that has strategic ruching around the waist area.
Bonus points for dresses with a pattern that fools the eye around the midsection. Color blocking is great for this.
I also like dresses that are intentionally more voluminous around the midsection (like pic 1 in Firecracker's reply). To get these to work, they've got to be sleeveless or have very fitted sleeves, and be on the shorter side to add back in structure in the arms and legs, and/or I can pop on a slim fitting topper to reign in some of the volume.
Midi length can be excellent as well -- I'm not sure why, but it seems to draw the eye up and down rather than lingering at the non-existent waist!
ETA: also shift dresses can be fantastic, especially if you don't mind going a bit shorter on the length to show off some leg. A shift dress for me is a fit-and-flare for others.