Tartan-wearing conventions among Scots

[Phil]

Also, the rapidly expanding global culture is largely American-driven, with American movies, TV shows, books and other mass media at the forefront. It is fast steamrolling indigenous cultural expression everywhere. Blue jeans instead of kilts in Scotland is only one example.

You are right, of course, with a few countries such as France managing to remain immune to a small degree. I think movies followed by TV shows are the main drivers of this influence with books less so.
But, of course, where did many of these cultural influences actually originate? Most, such as musical styles, would have been brought by the waves of immigrants and then modified over the years into the forms we see now.
This discussion, however, like so many of its ilk has migrated from one discussing Scottishness to one now discussing American culture. Understandable given the demographic make-up of the forum but not entirely relevant to the original subject.