Rather, by blocking the wind from the torso up, it created a space for the wind to create an updraft going around the Schurzen.
In other words, the wind was flipping her skirt.
Well, that and they are two large flat planes that are likely to generate lift themselves when an air moves over them.
I take it back, Nishizumi-dono... I've discovered a structural defect in my design...Yukari-san, what's that...?It'll guard me from any cold wind there is!*FWOOOSH*...You know, you shouldn't underestimate nature...It's too dangerous... It's defective~~Schür~zenUm... well geez... that's...How about one for yourself, Nishizumi-dono!?*FLOAT**FWOOSH*Overassumption*SLIDE*It's my special equipment for severe winters, the windproof Schürzen!
The Schürzen was an armored skirt used by German tanks in WWII