The culprit is this dress:
It was long back then when I made it and it is even longer now, making it a trip hazard. I was wearing suede boots and I think the knit fabric gripped my boot and the combo tripped me up.
I am very sore but very lucky- my left leg and left ribs fared the worst of all of me, but nothing is cracked or broken and I will survive!
My first sewing job when I can sit at the machine again will be lopping four inches off the hem of this dress. It is super duper warm being made of merino sweatshirt fabric so I've been wearing it all the time, pretty much taking it off to wash and dry then putting it on again!