A Blissy pillowcase. I started getting bombarded with ads for Blissy about 2 years ago, then I showed up at my senile mom's 2 christmases ago, and she had somehow ordered 6 of them (one for each girl in the family). That may have been the final purchase she made before I took away all of her spending ability. I was mad at the stupidity. Each silk pillowcase (standard size) costs about $90. I couldn't find any of the packaging, and the pillowcases sat in their boxes on a shelf for a month or two before I noticed she had started using two of them. So I took the rest, intending to send them out to the girls as she originally intended. Well, I started using mine and really liked it. Then because I switch between two pillows, I took another one. Then because I wanted to use them all the time, I took the other two so I'd have an alternate set when sheets get changed. They are really really good.
On vacation with family, my sister had a very bad day, so I gave her a nice clean silk pillowcase and she also fell in love. This was actually meant to be hers anyway. But now I only have 3 silk pillowcases, and on the few occasions when I use that second pillow, and it's on the off-week when I don't use the 2 silks, my face feels like it's getting "stuck" on the soft Egyptian cotton case that was always a pleasure before I knew what silk cases felt like.
So I did just get a cheaper silk amazon version and I'm deciding whether that is sufficient (about $20/each instead of $90). We'll see. I can't believe all of this for a pillowcase, but here I am.