I was looking for a rare type for a while and kept this, only trying it on and never using it. Because the back isn't open, I recommend it for people who prefer that. However, the neck area is a bit narrow, so you need to be careful when putting it on. It's also stretchy, and the sewing is fine, so I think you can use it for practice without any problems. It's a size M. I was able to wear it even though I'm not that slender, so it should be fine for people with a slim build up to 160cm, but depending on your waist size, you might not be able to wear it, and it might be difficult for those with a curvy figure.