I'm currently stitching my mother's birthday gift:
Both fabrics are silk dupioni, with the leaves fused using Pellon's Wonder Under (I had some in my stash). I worried about hand stitching through the fused fabric but it's surprisingly easy.
The thread is a Japanese silk thread that's approximately the thickness of #12 perle cotton. It's beautiful to stitch with. I use shorter lengths than I'm used to with perle cotton, otherwise the silk thread gets a bit gnarled / frayed. Not sure if it's because I'm pulling it through the fusible or if this always happens with silk thread.
I love this piece so far! I'd be tempted to keep it for myself but these colours are definitely better suited for my mom's complexion.