lol!! its the big cloth circle that goes around the tree legs.
https://www.google.com/imgres?imgurl=https://www.thestyleinsider.com/wp-content/uploads/2008/12/williams-sonoma-cutwork-tree-skirt.jpg&imgrefurl=https://www.thestyleinsider.com/kgw/2008/12/make-the-house-jolly-with-some-striking-decor-upgrades&usg=__x5Jla4D7dGq7TfXC20L0WiPGOYU=&h=282&w=285&sz=22&hl=en&start=15&zoom=1&tbnid=PT9QeGIF7YLjwM:&tbnh=120&tbnw=115&prev=/images%3Fq%3Dtree%2Bskirt%26um%3D1%26hl%3Den%26sa%3DN%26rlz%3D1R2ACEW_en%26biw%3D1345%26bih%3D527%26tbs%3Disch:10%2C396&um=1&itbs=1&iact=hc&vpx=112&vpy=193&dur=32&hovh=223&hovw=226&tx=103&ty=139&ei=YcLtTPvAJMjNnAe1lL3iCg&oei=TcLtTJ6wIYG6ngeeiZiQCg&esq=6&page=2&ndsp=26&ved=1t:429,r:9,s:15&biw=1345&bih=527