You are buying the crochet pattern to make the item/items shown and not the actual made item.
Materials: I used double strands of a thin rayon flake yarn, I would compare the 2 strands to a sport weight yarn. Check gauge. For smaller size 650 yards with long sleeves if using a single stranded yarn. Double if using 2 strands. Larger size 750 yards for single strand, double if using 2 strands. Size I crochet hook.
Sizes: I have only include 2 sizes for this pattern since smaller size will fit either small or mediums and larger size will fit medium to large. Because of the pattern used it would have been to small or very large to include another size so refer to sizes to determine the size that will best fit you. Small size measures 16 inches across the back and 13 from top to bottom. Large size measures 20 inches across the back and 15 incheas from top to bottom. Sleeves are wide, small size is 16 inches around and large size 18 inches. Long sleeves do not taper in and will have a flare at the ends.