I designed and made an easy & simple macrame jar cover. It is a variation of a common and universal jar cover design.
I used Lankava's Minimop yarn that is made of recycled cotton (80%) and polyester (20%) (700g = 490m).
Because the yarn includes 20% polyester, it may get too hot easier than 100% cotton. Always follow the fire safety with the candles. I use led-candle inside this jar to avoid it all get too hot.