Tan lines: whether you think they're the devil's work or signs of a sick vacay, they're kinda unavoidable (just don't Instagram them, we all know what happened to @BadGalRiRi's account: RIP). So, with this in mind, it's worth choosing your swim swag carefully. Which is why we've checked out the thousands (yep, literally) of options on ASOS to narrow it down to the best, whether you're after a high waist, teeny triangle or sporty onesie kind of gal.