Oriental shorts
Having stayed at The Oriental BK for decades, with Mr Vuitton and myself often wearing shorts when out and about (a respectable length, naturally), I have never been stopped by anyone.
A steely stare, shoulders back and an air of complete confidence works every time, but if you look nervous and scuttle in, then yes, the style police may pounce.
When the legendary Mr Wachtveitl finally retires I think you will find that dress codes will relax a tad.