This is Gloire du Matin by Syl Caron, not yet available to purchase yet but I'm sure it will be soon - here.
I used two skeins of BC Garn Silkbloom extra fine lace weight bought from Loop yarn shop in London and a 4mm hook. Actually now I'm trying to link this yarn I've found that Loop no longer stock this particular one. It's a shame - it is a nice mix of 55% Merino / 45% Silk. Started 13th-ish September and finished 21st September.