Quote - then your best bet will be to model the clothing around the base shape (the original OBJ file) and then add the Tyler morph, along with the other body morphs you want to support, into the base clothing.

^i disagree with this.

sure, if your morphed shape is just the base figure with bigger boobs, go for it. but there is a major difference between tyler and ryan. not to mention that his joints and JCMs are different and many of the base Ryan deformers have been stripped out and replaced with more precise JCMs.

if you want clothing that looks good on Tyler, then model it and conform it for Tyler.

i have never been a fan of 'universal clothing'.  when you go to a tailor the first thing they do is take your precise measurements, and then they tailor the clothing and cut to fit and flatter you.