Fitting G8 Clothes to G3 Characters?

Tourist

Another noob question.

Is there a simple way to fit G8 clothes to G3 characters?

I've seen it done but autofit doesn't seem to work this way.

agent unawares

https://sickleyield.deviantart.com/journal/Tutorial-Convert-Clothing-G3-to-G8-G8-to-G3-686682065

Tourist

Thank you very much.