NOTE FROM THE DESIGNER:
Pattern stresses the importance of a tension square to achieve best results. Abbreviations appear to be for a knitted pattern but not the pattern downloaded.
Hook size is a US size 7 (4.5mm)
Stitches used are US (UK):
Ch = chain (chain)
tr = treble (double treble crochet)
dc = double crochet (treble crochet)
READ ORIGINAL POST HERE