Quote - If I do that, I get the message "you  jmust select a figure in the scene with other objects fit or parented to it to save a wearable preset"

I had selected the bodysuit when I tried to save it as such.

But a preset - is that the item or a settings file?

You need to select the figure (Genesis) that you conformed (fit to) the clothing to. I usually just use the unmorphed Genesis base. Then you get a dialog that allows you to select what you what to save.

TD