My late Aunt made her own loo seat belt!
In the early days of the package trade she was returning from the Canaries in a piston type a/c. In her own words "It was a terribly rough night but when I thought it was okay I asked the girl if it was safe to go and she said yes. Anyway I had nearly finished when the plane hit a big "air pocket" (now my aunt always wore large volmuminous bloomer type underwear) and I went up, the seat went up and when I came down again my draws were underneath the seat. It took me well over 20 minutes to sort myself out. The stewardess did come and ask if I will all right and could she help? But I was certainly not going to open the door and let someone as young as that see me in that state!