Ms Cowan was first diagnosed with breast cancer in February this year. She had a double mastectomy in March.
"I said 'get them off'. It was an easy decision for me because I made the decision years ago, watching my sisters die. If I got it [breast cancer], they are both off," she told the Bay of Plenty Times at Red Square last night.
Ms Cowan lost one sister in 2005 and another in 2011.
"I went all out to make sure I carried on living. That's what I said to my surgeon - 'I choose to live. I want them off'."
Breast Cancer Support Services Tauranga manager Lea Lehndorf said the walk was a huge success.
"It's really uplifting for them to see there are so many people who are supportive and they are there to celebrate those who have survived and honour those who have been taken," she said.
"It's a celebration, it demonstrates a lot of support and creates a lot of heightened awareness. We are here and we are a local service. We are on the ground and we are working with survivors and those newly diagnosed."
Mrs Lehndorf said the event would not be a success without the support of the community.
The dressing up was a fun side and every year there was a costume she had never seen, she said. "The fact that everybody does give it that effort makes it that much more special."
-For more photos from last night's HOT Pink Walk, see page 10.