The fashion industry has been inclined towards body positivity over time. First, we used to have petite then came in plus sizes but if you are petite yet curvy and don’t easily fit in either petite not plus size category, you are a mid-size! In short, this midsize fashion is the category that falls in between these two categories. There is no set definition for mid-size but generally, any clothes that fall between UK size 10-18.