The thread is a size 60 HDT by Jess of Tat-ilicious on Etsy. It is called "Chilled Mess". I struggled to find a matching handkerchief for the thread and finally decided to improvise a bit. I had this one with a blue flower which could possibly work so I added some embroidered colours on the edge to pick up the colours of the HDT and bring the design together a bit more.
The edging pattern is "Pomegranate" by Ann Orr which I slightly modified and for which I designed a corner. I just looked back and I'm embarrassed to say that I started this edging more than a year ago and the tatting was completed last February! So there you go: it took me about a year to attach it to a hanky. Does that make you feel better about your own incomplete projects? (Assuming you have any of course!).
Here's one last photo (from the original post about this edging)
that better shows the tatting, and the corner.