Lol, when I think of Hippies, I think they like fairies a lot. So maybe that's why I see sim fairies dressed like hippies. Especially since hippy-wear took a lot from fantasy fashion. The vests, the loose shirts. The long hair and flower crowns. I never imagine fairies easting meat, and a lot of those hippies dabbled in vegetarianism. No mind you, I am American. I'm not knowledgeable in fae or anything outside of American media.
But in general, I don't picture hippies when I think of fairies. But for some reason, when it comes to the Sims. I can't put my fairy sim in basics. Or urban fashion. Or dark academia. It's gotta be flowy clothes and cute colored round mini glasses. And flower wreaths, man. And I usually make the Sim's occult clothing their formal or party wear. Unless they are traditional or elder. Then, they will always wear the occult-style clothing. Whatever they give us.