I got it first 😁
Well, it is pretty much what I expected, except the material is slightly stretchy fabric which is pvc-coated on the outside. Sizing is a matter of guessing of course, because they give you asian sizes. XXL fits me OK, I consider trying XL as well (I am 183cm tall, 78ish kgs). The main part is a tight dress with a front zipper all the way up and the only special feature is the position of the arm holes - behind the shoulders. And on the back there is another layer to enclose the arms, also zipper all the way through to the collar. The bottom is open, so you can pull up the dress and get your hands out. But this opening is not wide enough (even when stretched) to get it over the elbows.
Of course I have tried it a

eady. With the back part fully open, you can put on the dress like any other dress.The arms are free enough to close the zipper. Then there is a little challenge because the back part forms shoulders that you have to get into. One side is easy, the other needs a bit of wiggling and pulling (I could grab it with my teeth) to get it in position. I had a string on the back zipper to pull it up all the way and that finishes the job. Arms encased behind the back, no way to get to the private parts and if you want to sit, you have to sit on your hands. Getting out is not straightforward, the zipper can't be pulled down because the collar stretches and the end of the zipper simply bends over. So you need to lean against a wall and work the zipper down a bit first. And in an emergency case, you can probably tear the fabric...
Well, I like the idea of this piece and when I feel a bit more like spending money again, I might order a size XL for a snugger fit. It is quite comfortable and comes in various shiny colours (I got violet, the next one might be blue). Quality is not top of the line but the stitching is neat and even in this size I don't look like a garbage bag. Good enough for who it's for, as one of my favorite youtubers keeps saying 😉
I have a plan, but this might be a bit more dangerous: There is enough room to grab the elbows with the hands and I have a belt that tightens when you pull on one side. So put the belt right under the elbows and pull tight - box tie.