For this backless top you need:
Yarn - I used Truboo from LionBrand Yarn (100% rayon from bamboo), 1 skein = light 3, 3.5oz/100g, 241yd/220m (for size M I used 4 skeins of this yarn)
Hook size - 4mm / G-6
Scissors, Yarn Needle, Stitch Markers

Final measurements for this top for all sizes in inches:
Bust: 34 (38, 42, 46, 50, 54, 58, 62, 6)
Length: 26 for all sizes
Arm depth: 6.5 (7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5)