I guess the question is this: would you wear a black shirt otherwise? If you don't mind the monochromatic effect of a black shirt and a black jacket, and you don't mind the Johnny Cash comments, the only other thing you have to worry about is looking different- and figuring out about a tie. There was a thread (Blow your matchy matchy minds?) about dressing head to toe in Black Watch tartan. I expect far more people dress head to toe in solid black - there are several black-on-black tartan kilts available http://www.scotclans.com/kilt_outfit...k_kilt_outfit/

I don't think I would do it, other than as a costume, but that's just me. I bought a black dress shirt about ten years ago, to wear as part of a costume. I still haven't ever tried it on.