So long as they are decent sandals worn properly they can be perfectly professional.
Brand new running shoes SHOULD NOT be worn to run a marathon. 5K/10K "racing flats" should not be used to run a marathon. High heels, cowboy boots, flip-flops, sandals, clogs, etc... should not be worn as well.
Jamaica sandals are comfortable sandals worn by many. They can be found in online stores or by going to Jamaica. A common online store is Amazon, Walmart, and Macys.
Of course they can.
Safari suits are worn at all times when one is on safari. When one is not, it is entirely up to the wearer and the weather.
He wore sandals, or caligulae. Thus we know him from his nickname, Sandals.
There is a commentary after the film with the costume designer and he describes the clothing/suits.
sandals and mary james
socks shoes sandals slippers