"broad hairdo" is correct and can be used in written English.
You can use it to describe someone's hairstyle. For example, "Anna had a broad hairdo that almost made her look like a different person."
Orchestrating the encounter was Captain Dewson, a soft-spoken man with a broad, hair-trigger smile.
His shoulders were broad, his hair had held its dark color, his square-jawed, confident face retained a healthy-hued youthfulness, and his teeth, unstained, and strong enough to shatter walnuts, were still intact.
For years you could be sure that someone in the audience — in barely a whisper — would remind you that the woman with the honey blond hair, broad shoulders and killer legs was the last ballerina trained and hired by George Balanchine.
Adult pubic lice are smaller and broader than hair lice.
An obvious truth - for instance, "women just love guys like Daniel Craig" - becomes "our genes compel women to be attracted to men with a full head of hair, broad shoulders and narrow waists, who are perceived as having high social status".
She has short brown hair, a broad smile, and a strong chin, and wore vaguely hippie clothes: a plain T-shirt, patterned trousers, rubber boots.
For the first time since her Wimbledon debut as a broad-smiling, hair-beaded tennis curiosity in 1997, Williams failed to advance past the opening round of a major.
I found myself getting emotional as someone who struggled with finding beauty in her full lips, kinky hair and broad nose.
There is a long, broad crest of hair on the crown.
A broad face, streaked hair, chunky body, and not doing any waitressy number in hope of a bigger tip.
He was in his mid-forties, with a broad mouth, brown hair, and ears that stuck out like a terrier's beneath a charcoal stocking cap.
