Why don't people wear their kilts more?

[Wareyin]

Of course they can. There is no prohibition or otherwise apart from a few protected tartans. And, of course, anyone can pretend that they are Scottish or that they have an entitlement to some tartan or other. At the end of the day, however, the only people they are fooling is themselves and that is something they need to come to terms with. Provided they are happy to continue in some sort of “Walter Mitty” fantasy then who cares?
What is not acceptable, however, is the pretence that 16th century English people were happily wearing kilts. As Jock Scot has posted, if you happened to be a Scot in York at that time it was open season.

To chime in, Ren Fests or Faires are not in any way historical reenactments. I attend our local one at least once a year, and ours at least is supposed to be somewhat European, but mostly a fantasy. There are paid actors who pretend to be French. There are paid actors who pretend to be Ents (from Tolkein). There are paid actors who pretend to be pirates. There are paid actors who pretend to be gargoyles. There are also attendees who dress in kilts, or in suits of armor, or as fairies, or as pirates, or vikings, or priests, monks, or many other things. English being the language of the land, everyone speaks English, although the performers and other employees usually attempt British accents, mostly badly.

It is not meant to portray any real English or Scottish or French or Viking culture.