And I have proof in my hands today!
My closest town is a bit miserable and the charity shops dire tbh, but had to wait for a prescription so pooped in to closest one to pass the time.
Found a pair of wide leg 100% linen trousers with a flat waistband, mid rise (perfect for me) and pockets. They are extremely good quality, not at all see-through and the perfect fit. The stitching is amazing as is the cut. I have only recently seen this level of quality at White Co or Poetry.
And they were from Tesco 
I can only imagine they were purchased long ago and never worn, as they are like new. I could find nothing of this quality now almost anywhere on a high street so am a bit in awe for £5!
Certainly shows how different it used to be even in value stores.