Fez or curtain

In Bowler Dessert 69 on page 36 regarding Ulverston's museum [in a press item from 1994], I was surprised to see the phrase "a slice of" in the description of the curtain. Many years ago, Bill was admiring my fez and, when I told him that Joyce had made it for me, using a piece of curtain material, it gave him a bright idea. He said that he had "a lovely red curtain" that had belonged to Stan, and asked Joyce to make a fez from it. Joyce was reluctant to cut into a Stan heirloom, but no other piece of material would satisfy Bill; it had to be associated with Stan. The fez was not made because, when Lucy heard about the project, she told Joyce that the "lovely red curtain" was, in fact, yellow. So the curtain was spared the scissors on that occasion, but, apparently, has suffered since then. A strange mistake of colour which I never solved! However, there was a bit more. . . .   Lucy was not at all surprised at Bill's error, but I was. The ladies entered into a conversation from which I, as a mere man, was excluded. I thought that perhaps the curtain had faded, and later I asked Joyce, "Was the curtain red when Bill acquired it, and later 'turned yellow'?" Joyce did not know, but a Grand Sheik sitting next to her offered the explanation, "Must have been the lightning." Frank Sugden