Okay, I know that modern tartans are obviously fair game as it relates to formal attire. I am also reasonably certain that their ancient colored counter parts are as well. But I am not sure if weathered tartans are considered appropriate. My church is having a black tie evening next month just as something fun. I am buying a new kilt for such occasions and am trying to decide on which variation of the tartan to go with. I have a weird type of color blindness that stops me from being able to tell the difference between colors that are too similar. Which this means that on say the Ferguson modern tartan I have trouble seeing the green against the "cobalt" back ground. I much perfur the Ferguson ancient because I can see the difference in colors. But I also like the weathered variant because it's something that I havent seen much. I was wondwering if I should consider it as an option for my formal kilt?