Jar candles are lovely things. You can eke out a bit more atmosphere from them with a yarn cozy that lets you decorate the candle in whatever colors best fit the occasion.

This pattern is written in US terms.
Skill level for this cozy is EASY.

Hook: K/10.5 (6.5mm) (for the starting chain)
Hook: G/6 (4mm)
Yarn: DK/Sport
Size: Should fit a 4.5” to 6” (standard 20 oz) candle jar.

Could alternatively use worsted weight yarn with a H/8 (5.0 mm) hook.