I’ve never used CLO but I export from Marvellous Designer once in a while. In general it works pretty well, but the export is a bit fickle. Sometimes it works, sometimes not. Sometimes fbx is more stable, next time obj. So, if possible, ask for a re-export of problematic files.
Someone described working with MD is like training a wild animal. You need to go forward very carefully and it’s still quite unpredictable.