I think hourglass is more about your shoulders and hips being in balance, and less about having a teeny tiny waist. And your waist *does* look tiny - trust me, my waist is 27 inches but hips are only 33 inches! (my bust is also 33 inches and shoulders are 33 inches - yet I am also 6 inches shorter than you).
Looking at it another way, the ratio between your waist and your hips is 0.7, which makes you very solidly in the category of "tiny waist." There's no way you are an apple or a rectangle, not with those measurements!!!
As for having trouble finding clothes that fit, I think the first question is to ask: where have you been shopping?
I am wondering if perhaps the issue is that you may be still shopping in junior section? And now your body has changed and become more womanly? It is easy to get in a rut and continue shopping in the same part of the store we are used to. Also it is easy to get fixated on a certain size we always wore.... and even if our bodies didn't change with pregnancy and nursing and just natural maturation process, the manufacturers have been changing the sizes on us!!! So what used to be a size 4 ten years ago is now a size 0.
If that's not the case - and you are truly leaving no retail stone unturned, and trying on clothes in a range of sizes - then there's simply the reality that clothing is mass-manufactured for an "average" figure shape and very, very few of us are average. Most people are going to find something is kind of off with clothing bought off-the-rack. Best approach is to keep searching and find the brands that work the best, then stick to them and be loyal (at least until they change their fit model, sigh....). And get things tailored.
Regarding not liking belts, they aren't a requirement. Same goes for collared, button-down shirts (it's a very rare one of those that I can find that fit me, and even then, I just find them fussy). I bet you would look amazing in a wrap top.
Finally, can you be more specific? What brands have you tried, how do they not fit, and what do you define as "good fit"? I ask that last question because since finding YLF I'm realizing that my concept of "fits well" has changed quite a lot. I'm getting more and more used to more body-concious, form-fitting clothing. What I thought fit well a few years ago now seems too loose and baggy. So I do think it's an important term to define. It might be that clothes are fitting you just the way they are supposed to (your measurements are pretty common ones for your height), but that you need to adjust your eye. Does that make sense?