Favorite Luxury Yarn

I want to knit my mother a sweater using a luxurious, soft yarn. Worsted weight and up. I don’t like fuzzy, I’m leaning more toward a cashmere/silk blend, but I can’t settle on any one yarn. I’d love some recommendations! What’s your favorite luxury yarn?

I like Cascade Epiphany which is a wool, silk, cashmere blend. Very soft, lovely to knit with and wear.
Also their Venezia, a merino, silk blend which a beautiful drape.

I love Knit Picks Gloss, a lace weight, merino wool and silk blend,70%wool & 30 %silk.