I could have sized down but instead i went up a size because it to be a little bit longer on me. It is very stretchy and you can adjust the strings in the back. It does also have a nice material to it. I did a try on haul so if you want to see a visual it is on my tik tok @j_nikole97

135 lbs. 5’0”. I ordered a Medium and it fit great. The strings to tie in the back are elastic and the material was not transparent.