1. Find dead enemy.
2. Open his inventory and free his uniform so it can be moved to player's inventory.
3. Move (drag-n-drop) empty enemy uniform into player's backpack. => enemy uniform coverted to uniform of type which player has and not moved to player's inventory, instead laying folded on ground near dead enemy. It also can contain some items which are not shown if double-clicked into it.
4. Empty player's uniform => enemy converted uniform empties.
5. Drag-n-drop enemy converted uniform to player's backpack => works ok.
6. Open some vehicle container or ammo box.
7. Right-click enemy converted uniform in player's backpack. => Player's uniform from uniform slot moved to container instead of enemy converted.
8. R-click on enemy converted uniform again. => it moved to cargo. Now in cargo two same "references" of player's uniform.
9. R-click one of "references" in cargo. => player receives uniform in uniform slot.
10. Repeat steps 1-3,5-9 required amount of times.
11. Put some items in player's uniform => items appeared in all instances, all "references" of uniform. They all share player's items in uniform. If some unit takes such uniform and removes item from it, player and all instances of uniform lose that item. (kind of teleporting).
12. If in campaign, returning car loaded with such uniforms with items from scouting mission, on loading camp armory receives full copies (real objects) of all uniforms and all items, multiplied by amount of "copied" uniforms by player.

Video: http://www.youtube.com/watch?feature=player_embedded&v=iWCcBGgC0AM#t=273
See also Issue 24002.