Mrs Rashleigh has been in the industry for 20 years and fitted bras the world over.
It did not matter if she was in New York, London, the Middle East, or New Zealand - it was the same story everywhere, she said.
"Boobs are getting bigger and the customers are getting younger and have smaller bodies."
DD or EE were common cup sizes, and bra sizing went from A to J. The company she worked for, Bendon, was selling more bras in bigger sizes. She did not know the reason for the bigger busts.
"It's not about obesity. Bigger people are in proportion to their bodies. Maybe it's a generation thing - girls are developing at a younger age now. When I went to school nobody hardly had boobs."
Helping a woman find a well-fitted bra could be a life-changing experience for the customer, she said.
Women with large breasts often tried to cover them up by wearing baggy clothes, but a poorly-fitted bra could make them look worse.
"It's incredible how we don't look after our breasts. When I see people who run [without a good sports bra] I want to jump out of the car and arrest them.
"Your breast is soft tissue and it's held together with ligaments. Every time your breast moves, you're stretching the ligaments, which are like elastic bands.
"What happens if you keep stretching elastic? Eventually, it will not go back and your boobs will go south."
Nobody would buy shoes without trying them on, and the same should apply to bras, she said.
One of the most common problems she encountered when fitting bras was people wearing a bra with the strap too loose around the body.
And the one bra this self-confessed lingerie junkie says she could not do without? A well-fitted T-shirt bra.
Constant travel meant she could not pack 25 bras in her suitcase, but a T-shirt bra with smooth lines, no lace and a neutral colour was perfect for wearing beneath fitting tops.
