Maybe I'm wrong, maybe the Kilt isn't 'just clothes'.

[The Wizard of BC]

There is almost as much myth around blue jeans as there is around kilts.

Levi Strauss was not a tailor and never made a pair of blue jeans. There is also no evidence that he ever wore a pair. He ran a wholesale dry goods store in San Francisco. He opened his first store in 1858 which was 18 years after the California Gold Rush.

It was Jacob Davis who was a tailor who made and repaired the items which were called generically "overalls" and which we today call blue jeans. Overalls were commonly available but they were prone to wearing out. Jacob Davis was buying cloth from Strauss to repair overalls. Some of the first cloth was a hemp tent fabric but it chafed. Strauss got a hold of some cotton denim and sold it to Davis. It was Davis who came up with the idea of reinforcing the weaker denim fabric at the stress points with rivets. He called these "Riveted Overalls"
Davis had no money to take out a patent and go into production so he approached merchant Strauss.

Manufacturing of "Levi Strauss & Co's Riveted Overalls" began in 1873.

The design of Levi Strauss jeans has be changed many times even though the company marketing implies otherwise. What the marketing actually says is that the "label design" has never changed.