Quote Originally Posted by LKM View Post
I have seen several tartans from Wales that predate the Welsh Tartan Center by a few hundred years, most of these appear to be fashion tartans without a family connection implied with them. Many of the known welsh artifact tartans have been named for the earliest known person who owned them, and most were not registered or listed anywhere until recently. There are numerous pictures from the Victorian era that show tartan scarves, waistcoats, aprons, and shawls in all parts of Wales.

Some, clearly not all, of the tartans are listed at https://www.tartanregister.gov.uk/ yet you will need to search by name for the tartans.
By a 100-150 years (mid-Victorian) then yes but nothing much before then as far as I know.