Clothes with Layers
We can set the Layer number to 1 or 2 to keep pieces like pockets, flaps, or collars above the main (layer 0) material. During the new import process, uDraper will read this information and treat these layers accordingly.
See also this video: Marvelous Designer to Unreal Engine (part 2): Importing Clothes with Layers
For example, for this jacket, the breast pockets and the flaps’ layers should be set to 1 and 2 respectfully.