The T-shirt is made from white interlock knit. Interlock is stretchy enough to use in cuffs and turtle necks. If a different knit is used (such as T-shirt knit) substitute ribbing for the cuffs and turtleneck.
The shirt may be made almost entirely on the serger. If you don't have a serger, sew with a narrow zigzag. Knit does not unravel, so edges do not need seam finish.