Although there is no need to be seen attired in abayas, hijabs, kunmahs or the white long robe called the dishdasha which is worn by men, as a visitor one will be called upon to show respect when out and about in public places. A word of caution! Skimpy clothes are a massive "No" is not just in Muscat but in all of Oman given how conservative the nation is. Ideally, if shorts are your 'go-to,' then opt for ones that reach down to knee level and avoid sporting bikinis at any of the local beaches including Qurum Beach or Sifah Beach. Airy, long pants and t-shirts will work best for the women while shirts, t-shirts, trousers or shorts will certainly come in handy if you're a man hoping to visit Muscat shortly.