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Most of them, if not all, are vintage, meaning that they’ve been bought from random vintage clothing stores.
I can offer some similar sweaters and jumpers, courtesy of Etsy
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Asos offers many more, so I recommed checking their site. I filtered a few I liked and were similar to the style you’re looking for.
Pop Boutique was one of the stores where the sweaters come from, but on their site there isn’t much, just one similar jumper.
Phixclothing has a few to offer.
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Check out their site for many more.
Princes vary, but I think the highest I saw was 75$ for one I recommended.