Note that having a white lining on the tails (only) is seen on various of court dress tailcoats and uniforms, so it isn't outside the scope of tradition.

The London Cut: Japan Exhibition // Henry Poole & Co Evening Tails inspired by those tailored for Crown Prince Hirohito in 1921 flanked by Poole's Royal Warrant for the Japanese Imperial Household.

Japanese Imperial Court Uniform c.1890


https://worldroyalfamily.blogspot.com/2 ... ilip.html
Eckbert von Bohlen und Halbach, his wife Desiree von Bohlen und Halbach and a guest attend the royal wedding of Prince Carl Philip of Sweden and Sofia Hellqvist at The Royal Palace on June 13, 2015 in Stockholm, Sweden.