You don't understand. They've got perfectly normal legs under those things. They just wear them to fly. That isn't what's so... What's the term... Attention-grabbing about this series. Just take a stab in the dark about what is.
Overall it's not as well-written as Sky Girls, and why am I even bothering?
I'll watch it if it's that type of anime that leers lustfully at cool aircraft more than the girls. Combining a little girl with a P-38 or FW-190 is something everyone can enjoy.
I bet the bombers will just be big, but the P-47 will be the fat chick, and the twin Mustang will be twin girls.
See Caminante? You just need to compromise a little.
Chuck Yeager story time: When he was 19 and in flight school, there was a popular whorehouse a couple towns over where all the cadets would go in the evening to have a good time. The local town council disapproved of their nightly carousing, and had the whorehouse boarded up. So Yeager and a friend flew an armed trainer over and strafed the town's water tank.