But not quite the way you might expect. Theoretically using CITRUS or a similar body type with a wide variety of sliders, you can use it as an aid to convert any body type to any other body type...

Theoretically.

The CBBE Advanced slider set can work or be helpful as well, but CITRUS currently has a pretty good selection to choose from, some of them very useful for trying to match particular body quirks, so hey, may as well take advantage of it.

The trick I decided to try was to use CITRUS as a reference, load the outfit I was trying to convert, then load my target body as an outfit with the 'keep other shapes' box checked. After that, you use Ctrl + C to conform your outfit (but ONLY the outfit!) shape to the CITRUS sliders ... hide the CITRUS body ... and use the sliders to manipulate your outfit to match the target. Frequent use of "set base shape" and "conform to sliders" with occasional breaks for the brush work to smooth things out here and there. For certain outfits something like this makes it a lot easier to avoid particular kinds of distortion.

You still need to get the weights from your target body so you'd load it as a reference later for the 'copy weights' step - or just run the whole thing through Gerra's Mesh Rigger at the end. Either way.

I might write this up as a proper 'tutorial' later but in the meantime I figured I'd just toss it out there, see if anyone else finds it useful or if I'm not in fact the first person to have thought of using the reference sliders that way.