If you look at the claim, which defines the scope of the monopoly, you'll see it is very long. That is because folding coat hangers were already invented and reinvented many times over. Some example published applications would be US4997115A [1], US5632422A.
I've not looked at the OP yet, but I'd be surprised if they had a new invention in this space; possible of course.
A lot of these things don't make it to be products because they're too expensive for the utility they provide.
[0] https://worldwide.espacenet.com/patent/search/family/0748815...
[1] https://worldwide.espacenet.com/patent/search/family/0231371...
