Seems like a good way to sneak people across the border:
"Why do you have five mannequins in this large container?"
"To display our products of course."
"But why are all the mannequins so well restrained, with all the items already on and in them?"
"The restraints are to keep them from moving in shipment and getting damaged. The restraints are attached to save on shipping them in separate containers. Would you like to see one of our magazines with our models being fitted and wearing the outfits?"
Allows the models to get past the border guards without having to deal with customs on either end.