They are made by Diane Wilson, who crochets wonderful items in miniature, she's an artist! They are so darling I dubbed them "Elf Doilies" because they must have been made with special thread.
But this dress and hat are so cute I call them the Faerie Dress and the Faerie Bonnet.
Actually, instead of the usual size 10 or 20 thread for a doily, she uses size 80 (correction from previously posting it was size 40) or sewing thread. She makes a coaster pattern which can be used as a delicate doily for a doll house, and yes, to 1/12 scale.
She sells her lovely doilies here: Diane's Dainty Doilies