I went for a walk and missed this! I have not read all the comments yet, only a few, and will have to go back to read this long and no doubt fascinating thread in detail, but first, I was going to say, Angie, when have you even seen me in a tunic?
A traditional tunic (mid thigh length, horizontal cutting) emphasizes the shortness of my legs. I don't mind my legs (though I know it may sound as if I do). Honestly, though -- they are fine -- I showcase them in skinnies without a thought! It's the proportion that gets me.
I do like an asymmetrical tunic. However, it can be very difficult for me to find one that has the right proportions -- they are often longer on me than they are meant to be. I got the EF asymmetrical sweater in Petite and that was a huge help. I expect to have that piece for quite a while. I have worn it about 10 times this winter and it is a look that is growing on me.
I see, though, by skimming the responses, that your definition of a "tunic" is much broader than mine, encompassing what I call short dresses. I'm like LaPed -- for me, a tunic is something that falls (more or less) mid - thigh and if it is long enough for me to feel comfortable in it in summer without tights, I consider it a dress.
Angie, your examples -- I have tried to wear a knee length dress with cropped trousers or jeans. It's a really great look and I love it --- theoretically. Proportionately, it is also much better on me than a mid-thigh tunic...(just as DonnaF says) though my dress has to be a bit shorter than yours in your photo, and I have to wear a heel.
Interestingly, in my recent outfit lab thread, people tended to like my versions of dress over pants LESS on me than they liked dress alone or even dress with tights. So it can't be my imagination -- something about it works less well for me! Admittedly, I wore flat boots in one photo. But still.
Another problem with dresses or tunics over pants is I don't like the feeling of fabric "sticking" to fabric (pants to dress) when I move. I don't like the bulk of jeans zippers with an untucked top. So it's a lot of work for me.
Also, the cropped flares that make this look so spunky on some peopel are also not the best on my body.
Maybe cropped straights would be better...but I tend not to like a true straight leg on my body type either (though a crop straight is probably better). I like pants that taper at the bottom much much more.
I also think it has to do with weather..I need warm layers so much of the year, so that is an additional issue. A dress does not feel "cozy" enough unless it is a sweater dress, which would lead to more sticky feelings...
The other top you wear -- I'd call that a long blouse, not a tunic, and I might wear something like that (especially if asymmetrical). But only with a bit of a heel because otherwise it would cut me square in half. Not a good proportion to my eye on my body type.
Low rise pants are also not the best on me, as Donna F. says.
Okay. Off to read the thread in detail! And hopefully, to learn something!