In DAZ, export the initial pose to create the garment as an OBJ file. Select an avatar.

In the parameters panel on right, verify that Show Hidden Properties is visible.

Adjust mesh resolution and subdivisions for the avatar mesh. Lower as necessary.

Verify that you are in the first block in the aniMate panel at the bottom.

Export to OBJ.

Verify the following export settings.

Back in DAZ, adjust playhead in aniMate to first block.

Select new pose for avatar and add to scene.

Drag playhead back to 0 in aniMate.

Export new pose to OBJ with same settings as before.

In Marvelous Designer, import OBJ of first pose avatar with DAZ Studio for the scale.

Create the garment using the first pose for the avatar.

Import (Add) the second pose, but set the Object Type as Load as Morph Target.

Remember to set the scale to DAZ Studio.

In the Animate mode, record to allow the morph target to take on the properties of the garment.