These are some arm warmers for dialysis patients. It allows the port for the dialysis, and keeps their fingers easily available for checks by medical personnel. The arm warmer keeps their arms from getting cold as they sit during dialysis.
This pattern can be easily adjusted by adding or subtracting groups of 4 stitches, and is surprisingly stretchy.
A smooth yarn is recommended in order to see the basketweave pattern; don’t forget you can simply double-up (use two strands) of worsted weight yarn if you don’t have any bulky yarn on hand.