This is a scarf.
People wear scarves around their necks when it is cold.
Scarfs keep your neck warm.
These are mittens.
Children wear mittens on their hands when it is cold.
Mittens come in pairs. Pair means two.
Mittens keep your hands warm.
This is a pair of gloves.
People wear gloves to keep their hands warm. They wear a glove on their right hand and a glove on their left hand.