In an uncommon way, Elizabeth Hiddleson does not provide a size nor suggested crochet thread for this project.

Pattern features a heart shaped ribbon doily filled with

filet crochet using tr of a 4 grape cluster
bar and lacet
shell in shell edge

Pamphlet provides 2 detailed black and white photographs for reference and instruction on how to lace the ribbon as well as photographs showing the Ribbon Heart Doily used in a pair and in a group of 4.

Use 7/8 to 1 inch ribbon, allow 6 yds each heart.