The design took six months to make - the armoured corset took about three months and more than 500 transparent butterflies took two months.
Hebberd said she and Spriggs were back stage chatting with others when the winner was announced.
"Everyone in the hallway was shouting 'you've won, you've won' - we didn't quite believe it."
The 61-year-old said it was the first time she had entered the competition after "a crazy moment" where she and Spriggs thought they would "have a try".
Hebberd is an artist who creates sculptures and objects out of wire. She is looking forward to honing her sewing skills on the new machine she won.
The win follows on from the same design being named Supreme winner and People's Choice at the Art n Tartan Awards in Waipu in July.
The judges at the Bernina Northland Fashion Awards made a special mention of Rachael Pederson, who is a contestant in the show every year and a teacher at Whangārei Girls' High School, who encourages her students to enter. Several WGHS students did well at the awards, in particular Iris Metcalfe who won the Fantasy Fashion category.
It was the second year the Rotary Club of Whangārei South presented a sewing machine to the best school. This year it went to Parua Bay School.
Bernina Northland and Kiwi North will be showcasing some of the entries from the show over the next few months.
Results: Evening Wear: Lauren Thomsen 'The Eden Dress' 1, Fran Spick 'No. 5' 2, Rene Topp 'Golden Glam' 3.
Open Fashion Design: Emma Farrier 'Lady in Black' 1, Levonne Smith 'Kill Bill' 2, Emma Farrier 'Blast from the Past' 3, Doris Pilcher 'Sir with Love', highly commended.
Student Street Wear: Zane Lange 'Hip Hop 80's' 1, Rebekah Wall 'Transparent' 2, Caitlyn Salvigny 'Bluebird' 3.
Open Street Wear: Rachael Pedersen 'Nellie' 1, Levonne Smith 'An Alchemy of Lillies' 2, Danica Sketchley 'Denim Jumpsuit' 3, Doris Pilcher 'Fisherman', highly commended.
Junior Wearable Art: Greta Charlesworth 'Crocker Bird' 1, Thea Gray 'Kid in a Candy Store' 2, Stella Gray 'The Ripple Effect' 3, Luka D'Anvers 'The Piwakawaka Princess', highly commended, Kyla Halse 'Mother Pollution', highly commended.
Open Wearable Art: Carole Hebberd 'Me and My Shadow' 1, Margaret Rassmussen and Megan Petchforth 'Wahine Toa Aotearoa' 2, Doris Pilcher with 'Heart beat' 3.
From Trash to Fashion: Carol Rhodes 'Not a Winning Ticket' 1, Chiquela & Violet Blomfield 'Flying Duchess' 2, Evelyn Taylor 'Wild Garden' 3, Dyvani-Lee Thomason-Daly 'Paradise Rose', highly commended.
Cosplay: Wayne Carroll 'Gears of War Marine' 1, Diana Davidson and Justin Smith 'Jedi Temple Guard' 2, Diana Davidson 'Pocahontas' 3.