All early 1957 crosses that I have owned, and handled, had ribbons in the 46-47mm width range, ie a fraction wider than the wartime examples of 45mm width. (many of the crosses were cased and some were attributed) The ribbons had indeed a lighter feel to them, some did not glow under UV light. The much later 1957 crosses came with 40mm ribbons, but these were very synthetic to the touch -not at all the same feel as wartime ribbon - and glow under UV light. I have seen 40mm heavy cotton ribbon which is undoubtedly of the same construction and feel as the 45mm wartime type.