Catriona West, 40, was inspired by the experience of a friend who was diagnosed with ovarian cancer last year.
The Scotswoman, of Raymond Road, Maidenhead, said: "I wanted to help fundraise for her and raise awareness.
"I just thought that when someone has cancer a lot of people lose their hair through their treatment, so it's quite topical and shows support in that way."
Husband Philip was supportive of her decision to lose her orange locks and Catriona added: "It was something I thought about when I was younger but didn't have the guts to do it - now seems like a good time."
Her short hair has been lots of colours in the past but has been orange for about two years making the mum-of-two instantly recognisable.
Catriona, who said her new hairstyle is cold but 'liberating', raised £1,250 for Cancer Research UK.
Neighbour and hairdresser Rachel Tilley did the honours, watched closely by mum-of-two Shelley Hand, who is in remission from ovarian cancer, diagnosed at the age of just 43.
The 44-year-old said: "It's just brilliant.
"She was really keen to raise awareness and raise money and she's done both."
Shelley, of Beverley Gardens, has already raised £350 for charity at a December coffee morning and is organising a fundraising parachute jump and a Shine Moonwalk later this year.
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The Met Office has issued a yellow alert for Windsor and Maidenhead, Slough and Wokingham, warning that rain moving eastwards across the south of the country may turn to snow in some places.