On Thursday, Mayor Charlie Hales announced that knitters would be giving monuments holiday sweaters and accessories, the Oregonian said.
A statue of the "umbrella man," officially known as "Allow Me," was decorated with a blue cardigan decorated with large red poinsettias.
By Saturday, only the left arm of the sweater was remaining.
Jessica DeVries, the lead knitter for the group, said the sweater took 43 hours to make. She said she expected losing sweaters, but not so early in the season.
The sweater will be replaced with one from a thrift store, The Oregonian said.