My body shape is generally at odds with belts. While I appear to be a soft hour glass when dressed in something form fitting, and given my actual measurements ( 40-31-39 ) there is enough difference between waist and hips or waist and bust to just barely qualify as an hourglass according to some people. When I was younger I had an hourglass shape, but life has conspired to thicken my waist. Generally I identify more with what is variously called the rectangular, H or banana shape if you wish to stick to the fruit theme, which I personally don't. Following the dressing guide lines for the H shape usually works better for me than those for an hourglass, though I draw on the hourglass guidelines somewhat. I often look best in something tailored but I don't usually look best with a belt at my waist and I am not comfortable in really structured clothing
In this category defying body of mine, which looks best in fitted things but is too tall for the proportions of most ready to wear fitted dresses, I usually need a belt to hold up my jeans. Since those are not on the natural waist I have a good sized collection of hip belts. Because most of those don't have enough holes to accommodate being worn on my waist and thus cinched in smaller, I also have a collection of waist belts, but I find I don't use them much. Most of the time, after I apply a waist belt to an outfit I end up taking it off again. I find that it at best makes an outfit look no better or makes it look worse, sort of oddly chopped in half, and no doubt leaves a viewer questioning why I would want to draw attention to my waist anyhow.
In deciding that the guidelines for dressing an H shape were more suitable for me than the hourglass guidelines, I have noticed that the H shape also seems to generate a great deal of contradiction not seen with other body shapes. You can find any number of style gurus saying put a belt on it and create a waist as you can who say leave off the belt and let the eye flow away from the waist you don't have, either up or down.
Images of Cameron with a belt are scarce and in this one below I don't think the belt is doing her any favours. In the front on view it looks fine, adds a bit of pizazz to the look like a piece of jewelry and she has a narrow build so while it isn't really creating a waist it isn't drawing attention to a thick one either...
Or so I thought until I saw it from this angle. Now I think it is emphasising a thicker waist and draws the eye right there and distracts from her overall long and lean line.
There is another factor I have to consider, which is that for me personally, I am not comfortable with a belt at my waist. I am not sure why, but it is a physical response to a sensation I dislike. Here is an example of my own experiments in this outfit below. Other than the sandals, it all looks okay from this angle. But....
I rejected this look (and this skirt) because it looked too bulky around my middle, both with the thick denim fabric, a belt and the fact that my waist is not tiny. In photos it looks a bit better than what I saw in the mirror but that could be my expert posing. If I stood more sideways to the camera I definitely have that same look that Cameron Diaz has, with the middle looking as thick as everything else.
But in addition to feeling the look was dubious, what I particularly noticed was that I didn't like the feel at my waist. My waist was all I could think about because I could feel it, thicky and bulky and constricting me.
So the skirt went into the donation bag. I couldn't get it off fast enough, which is surely a sign this outfit is not for me!