It’s entirely possible that the dress may have been approved by the school official, but not the ample body that showed up on prom night hanging out of the dress.
An example; My friend has two daughters, nice young ladies both of them. One is built like a stick and pretty flat on top. The other is a little over her ideal, but what stands out is her bust line. We are talkin’ huge here. Like two zeppelins in a dead heat. Giant.
So basically the dress that would look very nice on the one sister looks like terrible on the other.
You just can’t clip out a pic of a dress and since it looks great on the sz 4 assume it will look appropriate on the sz 16 with the 48 inch bust line.