The great-grandmother, 78, has been clicking away for up to eight hours a day for the whole year, using up 25 miles of wool, to make the festive-themed red sweaters.
Now three generations of her family – plus springer spaniel Cookie - have proudly posed in their snowman and reindeer-themed jumpers.
Doreen, from Leatherhead, Surrey, picked up her needles in January to help fill the time, but her hobby soon turned into a marathon task.
She said: "I initially started knitting for something to do. I started off just making a couple of jumpers but it snowballed from there.
"I started getting requests and I didn't want anybody to feel left out. You really have to be knitting all the time to make so many jumpers.
"I would knit whenever I got a spare moment, from the time I woke up to the time I went to bed. I took my knitting with me wherever I went."
Among those kitted out are her four children, nine grandchildren and 10 great-grandchildren – the youngest being only a few weeks old.
Doreen, who first began to knit as a pastime after her husband Roy died 14 years ago, said: "It was something fun for me to do to pass the time. And it put a big smile on everybody's face."
The retired shop worker added: "I love my family and I really enjoyed doing something that has made them so happy.
"The girls got snowmen and the boys got reindeer, but some of the girls wanted reindeer. I used patterns at first, but I think I'm getting pretty good without them now."
Son-in-law James Spoors, 45, said: "It's a lot of time and effort. You'd just hear the clicking of her needles when she was doing them."
Doreen added: "Once I have finished my own jumper, I suppose I had better get started on next year's Christmas presents."