"Nearing 50 I feel that white silk satin is a bit youthful for me, but I still wanted to make it, especially after seeing in in person in Palazzo Pitti in 2015. So I decided to make it for my daughter."

Are you perhaps looking at this with modern sensibilities? After all, this was a dress to be buried in, so the image it meant to convey, at least for its final use, isn't youthfulness. True, she was only 40 when she died, not "nearing 50", but one could argue that today's "nearing 50" is at least as youthful as "only 40", given the overall improvements to available nutrition and healthcare.