Based on height not weight.
Let’s set something straight first, when you hear petite, you think tiny right? In fact, petite sizes are designed for woman under 161cm or 5.3” regardless of their size.
Our clothing is designed to flatter the shorter frame, proportioned to fit better so as the size grows, the length is maintained proportionally. We achieve this by illusion, using certain necklines, exposing skin in the right places, optimising the ¾ sleeves and using smaller prints to name a few.
Lastly, let’s get practical here, it isn’t a good functional piece without pockets! You wouldn’t leave the house without your phone and lippy, so every piece is designed with this in mind.