Final answer:
To contain moisture in the antecubital fossa, the best plastic garment choice would be the sleeve and hand garment, as it is designed to cover the arm and the area in question.
Step-by-step explanation:
The question revolves around the selection of appropriate plastic garment to contain moisture in the region of the antecubital fossa, which is the inner elbow area. In medical or healthcare contexts, it's important to use garments that match the anatomical area that requires protection or treatment. Given the options, the appropriate garment is the sleeve and hand garment. This type of garment is specifically designed to cover the arm, from the hand up through the antecubital fossa, thereby effectively containing moisture in that region.