The currently available 'height' slider on the character creation screen actually controls a uniform 3D scaling factor instead of height, and there is a technical reason for that (it's called 'armor'). The implemented system is not terribly realistic since in reality the head doesn't scale with body size, and apparently, people would want to have non-uniform or even body part specific scaling options. While it would certainly be fun (and I bet that some people would like to have even more 'fun' than the others - a good reason if any for not enabling it

), from a technical point of view it would become a nightmare. There are already clipping problems and other graphical glitches in the one-(scaled)-size-fits-all approach, now multiply that with all the possible combinations of body shapes that the extended customization interface would allow.
And yes, when comparing the Vabbian and Canthan female elementalist chest pieces, it is quite apparent that the Canthan version has at least an inch of padding in strategic places. I prefer Vabbian, even at the risk of a major wardrobe malfunction