Creating a rashie that women actually felt sexy in may seem like an impossible task, but if the waitlist of 500 plus women who signed up to purchase one before they actually went on sale is anything to go by, she's nailed it.
"The seed for the Une Piece was planted during my time on the beach in Europe," she says.
"I felt more confident and beautiful in a one piece but I couldn't really find something that suited me ... I wanted something that was elegant, flattering and made from good quality fabric.
"It's always been a challenge to cover up from the sun, and yet feel sexy.
"The Une Piece allows women to cover their back and shoulders, and choose the level of sun protection on their chest. The high quality Italian fabric ensures a shape-defining yet comfortable fit."
The Une Piece, which is manufactured in Australia, went through 11 design iterations before the team were 100 per cent happy with it.
The shape-defining element is one of the factors that sets the swimsuit apart. There are 28 pieces to the Une Piece, making it "incredibly contouring" on the body (most rash vests have four).
"It works on so many different shapes," says Brown, adding that the pieces are available from a size 6-16.
The fabric also has a rating of UPF50+, which only a handful of Australian fabrics have.
Brown has a strong business background - she has held senior marketing positions at Coke and Revlon in Europe and Uber in Australia - so it's little surprise that she managed to drum up so much interest in her swimsuit in the lead up to the official launch.
The Une Piece retails for A$195 and currently come in white, red, navy and black.
Brown has her work cut out for her in early 2017 - she is planning on launching some new Une Piece designs, as well as welcoming a baby boy.