Sorcha was a bit sweeping earlier on. Certainly, many of the "named" tartans as we know them today were invented in the wake of the craze for all things Scottish that followed King George's visit (masterminded by Walter Scott) by fabric companies jumping on the bandwagon, but whether they were Scottish- or English-owned, I wouldn't know. Highland dress was proscribed (by the British, not English, government) for some years following the last Jacobite rebellion, but only in the Highlands.