You are right.
Sometimes this works very well, but sometimes not, it also depends on what body areas were transfered in the conform-fitting process.

And on dynamic clothes you can have problems if the fit is too lose,
and if the clothes are made too small, constrained areas will not stretch and adapt to wider body parts.

But I agree that clothes should foremost work on the base figure, what I meant was clothes and hair that
are confirmed to work and have prefit morphs, and suit the character in style etc.