4.5 import of clothed figure from 3 clothing not fitting

Urumike

I have an annoying problem.

I used to work with Studio 3 Advanced.
I have a lot of figures with Morph Follower fitted clothing. (V4 and M4)

Whenever I try to load one of them in Studio 4.5 Pro the clothing follows the pose but not the figure, same with the hair.
It's basically all too big...

'Fit to' is set correct...

I was under the impression 4.5 should import scenes from S3A flawlessly?

If not, does that mean I have to rebuild all my clothed characters in order to use LAMH and other plugins written for S4.5?