Marvelous Designer comes with some clothes hangers. There are many 3D clothes hangers on 3D marketplaces.
You can import any 3D clothes hanger into Marvelous Designer. (Remember to import it as an avatar not as a prop or the clothes won't hang on the hanger, they'll go right through it!)

i see a clothes hanger (very nice wooden one!) as part of the free hanging clothes download on cg elves website in freebie section. great for interiors and architect too. see a cool one i especially like - 3d hanger model for skirts in Marvelous Designer all the free 3d hanging models here  👍