Tip: different yarns will create different sizing.
3 st = 1 inch with this pattern and my crochet style

Sizing is estimated
50 st = 17.5” (35”) for the small size which may also fit medium.
55 st = 19” (38”)
60 st = 20” (40”)
69 st = 23” (46”)

Please send feel free to contact me with any issues in the pattern or questions.