kirsten_corleone: in Firestorm you just click the little phoenix icon and hover height is on there - there are other ways, but that is where I fiind it easiest. Gyazo
mishaselene: I've been using bom for my genus head but still using layers for my body so this was a first for me hahaha. Oh so confusing. But it's all sorted now thankfully thanks to you all!
So you use the old way of wearing a skin, by actually applying an SL skin (or several layers of them) to the SL body, which all get baked into one (old feature)... and this baked texture then gets mapped onto the mesh body.
That surely works best if you have a mesh body that is closer to the original SL body, cause it will have less flaws and/or designers have to fix less things to make it work. That's why some mesh body/head creators released new versions of their stuff.