WimvdB, before I gave up I had tried Mada’s Cuddles, the Bambini boys and girls clothes and Pajamas, I did find out that those all support the toddler morph, so you might be on to something. I also tried 3DTubeMagic’s K4 Fairy which didn’t have the toddler morph support (chibi, kelda, realistic and thin) and the RPublishing K4 Playset (don’t believe that supports the toddler either). I tried the K4cowpoke set , the boys version(came with the K4 Pro bundle). turns out it supports the toddler morph also. Then tried some freebies by Sanbie, Pajamas and and Day wear that only support heavy, thin and Realistic.
In all cases, I loaded the clothes to Daz Studio and the Base Genesis figure, picked K4 from the autofit dropdown, let it do its thing… I kept the shape list short for these, I added Basic Female, V4 and V5, Basic Child, Heavy, Pot Bellied and Thin. Then used the cr2 exporter, located the outfit obj when prompted, same conformer settings as for all the other clothing, saved it into the Poser Genesis Runtime.
But with every one of the outfits, I got the same problem, the clothing all loaded too small and got even smaller when conformed. I just got tired and quit trying. My first effort included the Genesis infant shape, but I deleted that effort, thinking it might be the problem (dependent parameter issues came to mind) I tried with just the child, heavy, thin and, pot bellied) no joy. And I even tried with just a basic female and V4 shape, again no go.
I can go from adult original clothing down, but not from child clothing up. *sigh*