There isn't yet an AutoFit clone for Genesis 8, and for Genesis 2 and 3 the clones are not free, but you could use AutoFit to convert the clothing to Genesis and then to convert that to Genesis 8 - just fit the item to the figure, if it doesn't do so on loading, then select the source figure (Victoria 4 on Genesis, then Genesis on Genesis 8) and optionally the type of clothing. Custom bones will be lost, and some things (especially shoes) convert badly, but many will not be too bad.