This is a hook I designed and made so that I can create a hanging stack of shirts. Inspired from the hangers that are sold with the hook built in but why replace all of your hangers.

This helps to creates more room in your closet.

I am sure there is a limit as to how many or how much weight you can stack (all of that weight is bearing on the top hanger) but I haven't found it yet and I don't usually go more than three or four deep.

SolidWorks 2014 part file included.