Steaming sorted!

A friend had posted an idea to stop glasses steaming up whilst wearing a facemask. She had straightened a plastic covered paper clip and put it between the 2 rows of stitching. 
I experimented with different millinery wire ( too thick/too firm) then found some old cake decorating wires... poked through into the channel between the edge and the topstitch, with the wire segment then closed off with a hand stitch each end.

Perfect! Has been tested with Thomas Castaignede and Colin Firth, and no steaming!