It was a little sketchy to order a one size fits all, but I usually wear a s/m, I'm a pretty basic body, 5'7 and 130lbs with a pretty basic build. It took 16 days to come which was a long time but it says 15-30 days so it was expected. It smells really weird when it comes but I just threw it in the wash. There also aren't any tags on it. But I actually really like it. it's a little short on my wrists but I just pull it through out they day or push them up. It's a soft material and it seems pretty well made. If you like it, buy it, if you don't wear a small or small/medium, don't buy it because it won't fit.
The sweater is definitely a small/ medium fit. I love the way it looks though! Probably my favorite sweater right now plus I get a lot of compliments on it. The sleeves are shortish but it's still really warm and comfy.
I ordered a S and I'm 5'1 I personally really liked it it. It fit and although itchy it was very cute!! I recommend but if you have long arms the sleeves might be a little short, I don't though so it fit well.
I'm 5'6" 147lbs and it fits really nicely. It's a cute sweater, although it takes FOREVER to arrive and it has a foul smell. The material is kinda itchy, so make sure to use tons of fabric softener when you wash it. Other than that, it's an adorable sweater!