The quality of this jumpsuit is amazing! I do think it runs a little bit big so I would size down, the material is pretty stretchy. I am usually a true small in Zaras / ASOS (4) and I got the XS and still had some room in the lower back area. I also think the jumpsuit is way too long but overall I love it. This is my 5th purchase (all overalls) with Shop WWW and I'm still impressed.
Rated 1 on a scale of minus 2 to 2, where minus 2 is Runs Small, 0 is True to Size and 2 is Runs Large