The Sunshine Coast is a very casual place so men, leave your suits and ties at home. Off the beach, shorts and shirts for the guys and anything not too revealing for the girls is fine for daytime. Shorts or a sarong over swimming costumes is considered polite. Hotels and top restaurants expect smart casual at night. A light jacket is handy if it's a cool evening or you choose an air-conditioned restaurant.
Stockings are for cities.
Al fresco dining is all the rage most anywhere on the coast, so dress light and be comfortable. Remember the Queensland sun is very strong, so cover up with a shirt and wear a hat and sunglasses. Take a jacket or a jumper when you visit the Blackall Range. It is cold up there on winter nights and noticeably cooler than the coast the rest of the year. Be sure to pack good walking boots if you plan to hike through the many national parks.