The projection morph sets seem to work pretty well for most V4 items (on G3 or G8... I'm sure they do pretty well on G2 and G1 as well, but I don't use those as much.)
I remember getting the setup from here somewhere... could be the "wear them all" set? Can't remember the name, sorry. The process is to fit the item on a G character, then select the figure that the clothing was originally made for, and the type.
For anything -really- old, I use CrossDresser to convert the item to V4, and then I can put it on G3/G8 no problem (though sometimes that does get a bit wonky.)