Originally Posted by
Aedilred
This is probably the result of a confusion between a dinner jacket and a smoking jacket, which to an eye unfamiliar with weird British behaviour might appear to be worn worn at similar times, and often have a similar cut. They serve a different function, though (a smoking jacket is much more casual) and where DJs are usually black (occasionally white) smoking jackets tend to be more colourful, and made from a different material.