Any other country you would no doubt where shirt and tie, as I have done when I've met him in England. My conscience was heightened when speaking to a Barbadian policeman and how the force always salute Sobers as a sign of respect when they come across him (and thanks to his playing days with the Police Cricket Club).
In the end I went for t-shirt and flip-flops and Sir G turned up wearing the same: that's how you dress in the Caribbean!