In DS 4.5 the autofit does not loose the morphs. However I can understand if updating to 4.5 is not an option since it is beta and uses a different file format for saves and such.
To retain the morphs in DS, say no to autofit. (I dont remember who I got this from in the old forum but here are the steps)
Cancel the AutoFit dialogue, if it appears (it appears only when the clothing is fitted to Genesis).
Select the clothing and convert it to weight-mapping (I think it’s in the Edit menu now, but it’s certainly in the Scene palette option menu - right click on the tab, then go to the Edit sub menu). Leave TriAx selected and click Accept.
Next launch the Transfer utility (again, I think it’s in the Edit menu but it’s also in the Scene pane’s option menu, in the Asset sub menu). As Source select Genesis, and for the Shape select Clone and then the figure the clothes were made for in the pop-up dialogue. For Target pick the converted clothes. Click the button to show extended options and check Reverse source shape from target. Optionally pick a template, as you would using AutoFit. Click Accept.
That should give you converted clothes with the morphs intact.
I was fitting M3 stuff to Genesis earlier today and it went pretty well for me. Dont forget to add a smoothing modifier too.