Woodruff Turtleneck Needles + Notions
(Larger) US 2.5 / 3 mm circular needles, or size needed to obtain gauge after blocking.
(Smaller) US 1.5 / 2.5 mm circular needles for the ribbed hem, collar, and cuffs, or size needed to obtain ribbing gauge.
Generally circular needle lengths that are ~75% of the finished bust measurement will be comfortable.
Several stitch markers (including a few removable ones), darning needle, scissors, tape measure, waste yarn for putting stitches on hold.