One way to solve this quantum mystery is the ass-to-pants ratio test. Are the shorts congruent with or cut 2cm longer than the biggest pants you own? Either way, they’re too short. In fact, multiply this number by three and that gives you an acceptable length. I don’t care if your posterior is better than Beyoncé’s; we don’t need to see it popping out of your shorts. And don’t think that wearing flat shoes makes it OK. There, I’ve said it. Now try on this Levi's pair: cute but cool — and, crucially, they won’t bring a blush to anyone’s cheeks.