Fitting older clothing with Genesis models

I was pretty excited when I realized that Genesis models (like Aiko 5) can take clothing from older Daz Studio model format and still fits reasonably well.  Nothing is perfect though:

• It only works for Victoria/Akio 4 and later, meaning my clothing for Aiko and Victoria 3 won't work.
• Something specifying clothing type works, sometimes it doesn't.  Like when I tried to fit Maiden 4 Glove to Akio 5, the glove had some spikes generated.  If I don't specified the clothing as glove, the spikes disappeared.