Yeah she is a dummy, obviously believes strongly in gender stereotypes.

Actually I feel like I remember reading a news story where boys at an actual private school started wearing skirts in the summer because it was so hot and the dress code didn't allow for shorts, it was both as a form of protest and just because it was too hot to comfortably wear pants. https://www.independent.co.uk/life-style/teenage-boys-wear-skirts-to-school-to-protest-against-shorts-ban-in-heatwave-b1887321.html