• On Sunday, Emily Ratajkowski shared a photo of herself wearing a blue polka dot bikini on Instagram.
• The obvious star of the picture is the model's mammoth straw hat, which extends halfway past her outstretched arm and could easily double as a portable beach umbrella.
• A celebrity favorite designed by Simon Porte Jacquemus, the gigantic accessory, "Le chapeau Bomba," retailed for $431 and is sold out everywhere online.
• Mexican brand Olmos & Flores also makes an oversized straw hat that is popular among models and influencers alike.
• In early June, Bella Hadid posted a photo of herself wearing the designers' $6,500 Palapa hat on Instagram.

Emily Ratajkowski has taken sun protection to a trendy new level as she vacations in Greece.

On Sunday, the "I Feel Pretty" star, who spent the weekend in Mykonos with model friends Gigi Hadid and Kate Moss, shared a photo of herself in a blue polka dot bikini on Instagram. Ratajkowski accessorized the top, a piece from the model's own swim line, Inamorata Swim, with high-waisted, baggy drawstring pants, gold hoop earrings, and what appear to be chunky white dad sneakers.

But the obvious star of the picture is the model's mammoth straw hat, which extends halfway past her outstretched arm and could easily double as a portable beach umbrella.

Function aside, Ratajkowski's hat also serves a fashionable purpose. A current celebrity favorite designed by Simon Porte Jacquemus, the gigantic accessory, "Le chapeau Bomba," retailed for $431 and is sold out everywhere online. An extra-large version of the straw hat, which retailed for $697, was recently spotted on Danish actress and model Emma Rosenzweig, who wore the trendy accessory at her wedding in June.

Mexican brand Olmos & Flores also makes an oversized straw hat that is popular among models and influencers alike. Most recently, Bella Hadid wore the designers' $6,500 Palapa hat during a photo shoot for Vogue Mexico's July 2018 issue. According to an Instagram post by Olmos & Flores, the hat's design was inspired by palapas — open-sided structures with roofs made from dried palm leaves — in the coastal city of Ensenada in Baja California.

Jacquemus did not immediately reply to INSIDER's request for comment.

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