The subject of Tradition takes up a sizable part of any Anthropology or History course taught today.

Taken from the Latin, Tradition comes from Traditio which is usually interpreted to mean the handing over or passing on.

Most courses define it as a belief or custom passed from one generation to the next as "This is the way it is done", or "This is the way we do it", or "This is the way we have done it in the past".

As this passing on or handing down is usually done orally it is subject to the slight changes oral communication is and has always been prone to.

There is no time frame accepted to define a Tradition. Christmas Traditions are usually used to illustrate this. The artist who originally drew the Santa Claus for the Coca Cola Company was still alive when his concept of what Santa Claus looked like was accepted almost universally.
Christmas Traditions are and come under the broad heading of "Invented Traditions". In truth, we made them up. It was nice to pass on to our children the things we liked to do and made us feel good. So many Christmas Traditions had little or nothing to do with "Truth".

Another example of "Invented Tradition" is the Neo-Druid. From Historical fact we know almost nothing of the Druid. Just a few Latin sentences from Roman letters and military reports.

Another is speaking of Celts as if they were a Country such as the Countries of France or England. In fact the Celts were the people who spoke one of the Celtic languages. So it is not correct to lump all who currently speak a Celtic language, or had ancestors who did so, as Celts just as it would be incorrect to refer to all people who speak the French Language as French because not all French speakers live in the Country of France.

So, if I'm in France and someone calls out "Hey, English dude" I'll probably know who they are talking about even though I am not English. I am Canadian.

So, when someone refers to themselves as Celtic it is common to mistake their meaning. Are they saying "I speak one of the Celtic Languages"? Or are they saying "I can trace my ancestors to someone who spoke one of the Celtic Languages"? Or are they saying "I'm am a citizen of one of the Celtic Nations"? If the latter, they would probably be mis-speaking.

When we speak of Tradition here on this forum is gets even more confusing.

As the word Tradition means some custom or belief that has been passed on or handed down it also must imply that that custom or belief may have changed.
There is an entire section of this forum where you can look at pictures of how people wore the Kilt in days past. is the manner of wearing the Kilt exactly the same and unchanged today as there was then. No. So some things have changed.

Would it be proper to call some one who dresses in the manner of the 1830's, in the Kilt with no set pleating to his Kilt, wearing three or four different Tartans at the same time, with a Basket Hilt sword over his back, a Dirk on his belt, and a brace of Pistols loaded and cocked, Castellated Hose, and a three foot long hair Sporran with 17 Tassels "Traditional"? Yes. Would it be wrong to also call him anachronistic or wearing a costume? No.
But it would also be correct to call someone who dresses like a Pipe Major with Tall feather hat, Cross Belts, 26' long Pipers Sash and Spats "Traditional". But would you go to the Pub with your friends dressed like that just because "It's Traditional"? I think not.
How about the recently posted picture of Prince Charles wearing a Tweed Jacket and Brown Sporran with Black Shoes? Is he less "Traditional"? I dare you to say so.

So, what I'm saying is that we should exercise some caution with the word "Tradition". Saying "I dress in the Tradition of 1830 Court Dress" and saying "I dress in the Tradition of 1951", are two totally different Traditions of the wearing of the Kilt and both are correct.