It's all about personal choices!-White dinner jackets are common in warm climates, and in the summer in some temperate countries. The British Isles are not considered warm enough for white dinner jackets to be acceptable, even in the summer. In the United States and Canada white dinner jackets may be worn from mid-April through to Labor Day. The wearing of white dinner jackets in Europe and temperate climates is frowned upon in the United Kingdom; and many maintain they are appropriate only in India, the Caribbean, and in the former south east Asian colonies.
"TODAY! 2006 - EVENING SEMI-FORMAL: In warmer temperatures or during the summer months, a white/ivory dinner jacket can be another option for black tie affairs. Dinner Jackets should only be worn from May through September with the exception of warm resort locations or in hot-weather states where it is appropriate all year round.
The Dinner Jacket should be worn with black trousers with one satin seam on the outside leg, black vest or cummerbund, black bow tie, white silk scarf, black or gold cufflinks and studs.
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