Allowed? What is offensive about jeans? People wear them to funerals now.

This isn't beating the chess elitism allegations

Can't believe they're allowing jeans but still banning butt plugs.

Fide president Arkadi Dvorkovitch said: "The principle is simple: it is still required to follow the official dress-code, but elegant minor deviations (that may, in particular, include appropriate jeans matching the jacket) are allowed."

The Canadian tuxedo has been officially endorsed as proper attire.