Polka dots make a return every summer, alongside similarly classic florals, stripes and gingham. This year, though, they feel ubiquitous. From the sea of polka dots at Olivia Dean concerts to Kate Middleton's Royal-approval and the unofficial Wimbledon dress code, the whimsical print is dominating both the high street to high end. Resistance is futile: it's only a matter of time before they find their way into your wardrobe.