The adventure look utilizes safari/bush jackets and shirts and combines them with other more common pieces like casual trousers, a wide brimmed Panama hat, white bucks, saddle shoes or spectators and even an ascot for kicks and giggles. It combines the rugged and untamed (safari jacket) with the sophisticated and clean-lined (casual trousers, Panama hat, etc). This look is fine for non-formal parties and and outdoor events where the heat keeps you from breaking out the tie.
Here's a very well made modern Willis & Geiger safari jacket I recently found at Goodwill. This specific jacket is very British in cut and style, similar to British tropical jackets seen in North Africa, Italy and the Pacific during World War Two.
click photos to enlarge
And the back showing the neat bi-swing pleats above the belt that turn into pleated vents below the belt. Fine quality.