The chair is a Luther Conover design. It is made of fiberglass and they came in just about any color you might want. They were made in the late 50s-early 60s. Conover was, along with Charles Eames one of the modern style furniture designers for Herman Miller.
I remember these chairs being quite common when I was a child in the late 60s- early 70s. By the late 70s they were considered old junk and thrown away, especially if the fiberglass had cracked from frequent use as one would see in these chairs that were in institutions.
Today, if that chair were cleaned up and it was free of cracks, it would easily fetch $100 wholesale.
Those were nice suits at one time. Formal attire. Sometimes patients in these type of institutions have musical talent and were assembled into performing acts. If they were performing for a public event they would want to be dressed in appropriate duds. Even Nazi concentration camps had musical groups consisting of the prisoners.
Just one possible explanation. The information that we have is, some things that were at one time really nice suits are hanging in the basement of what was at one time a mental hospital. They were there for some reason. Put there for some reason. And left there -- why?
Considering the exposure to mildew, moisture, and just time, those suits would not even survive an attempt to clean them. They would end up in shreds.
I just don't know. Did a Google image search for all the suggestions, Gabby Bear, Teddy Ruxpin, Alvin/Chipmunks doll, and there is nothing that I came across that I could confidently say is a match. The slot in the forehead is strange -- I have no clue as to what purpose it served and I have never seen a toy with that kind of thing in the forehead. The mouth suggests some kind of ventriloquist item and the hair that remains on the face as well as the nose indicate an animal character.
I think that this was, at one time, a regular wheel-chair that has been modified to serve another purpose. The reason that I think this is because the wheels appear to be those of a standard wheel-chair. The metal pieces that are attached to the sides of the wood structure above the frame are newer and shinier looking than the frame. The vertical sides look to be standard building-grade 2X4s with 1/2" ply attached to the sides (you can see the exposed edge of the ply.) The top is from something else. An old laminate table (?) top that has been cut with rounded corners and you can see the de-lamination happening from years of exposure to moisture. This is a cobbled-together make-shift contraption to serve a specific purpose for this institution.