Will Ferrell is closing out the holiday season in iconic form.

Kate, now 42, was seen arriving at St. Mark's Church in Englefield, where her sister Pippa got married a year later, wearing a chestnut brown coat dress from Hobbs ... a forest green coat dress ...

a callback to his wildly popular role as Buddy the elf -- aka Buddy Hobbs, the goofy human who grew up as one of Santa's elves -- from the 2003 hit comedy movie. Ferrell wore Buddy's iconic green ...

Alongside her green ... lace dress at the War Horse Premiere, in January 2012, but then, just months later, donned it again, at the St. Andrews University Gala, in December 2012. Hobbs Coat ...

Ronald Martinez/Getty Images Ferrell wore Buddy's iconic green and yellow cap and green ... tries to reconnect with his birth father Walter Hobbs (James Caan) after being raised at the North ...