It honestly looks like a diaper onesie combo. Imagine how when it gets wet it's going to sag in the back than it already does because of so much fabric bunched up there. Totally looks like she's got a full diaper on under it
Isn't this useful! "This is what our teacher taught us on the last day of French class. Did I mention she’s awesome?" // Not actually a school idea (never ever), but it's French so I'm putting it here.