This is the outfit she wore in the funny scene on the park: "Peeeniiiiiis". The style is preepy. A white shirt, blue-gray vest, tie and a gray skirt.
The shirt I had. I bought at a business clothes store.
The wool vest was a bit more difficult. It was summer, and I could not find many options. I found one which was gray in color, but I decided to dye it right. After the FAIL that was my first attempt to dye the pants, I was a little afraid, but this time I did right! Yey! \ o /
The skirt I bought at Aliexpress.
The result looked like this! I had to learn how to do the tie and everything! Now wait a minute there, I'll scream in the window! Peeeniiiiiis! Ooops! :-P