Hello from Rome, Italy

[elrond]

I choose the Royal Steward, starting from the History of "Bonnie Prince Charlie", who was born and raised in Rome, and apparently give the right to the Roman Citizen to wear his tartan because the hospitality given from the catholic people and from Vatican. His mortal remains are still here in Rome, in the crypt under S. Peter Cathedral.

I'm still finding an official confirmation about this. (maybe someone here can help).

Yes, it is as you said, even if royal Stewart and Prince Charles edward are two different tartan. You can wear coth if you want, because bonnie Pirnce Charlie give us (I'm itlaian too) the right to wear his own tartan.
I chhose Black watch waiting to wear the MacKay one when I'll be a member of the Clan MacKay Association.

the right day to wear a kilt it is everyday! I wear it everyday, only I cannot do it at work, but as I end my job everyday I wear one of my kilts and do the things I have to do. There is no need to have special occasion: every day is a kilt day!
Ciao!
(I played rugby at school and after american football with Pirates Savona)