New Zealand fashion designer Annah Stretton is giving two lesbian Australians a helping hand in the matrimony department. She will be offering two Australian women the chance to marry at her public show during the fashion weekend in September.

Two lucky lesbians will be making their union legal at Ms Stretton's fashion show on September 7 at the Viaduct Events Centre in Auckland. And to help them make their wedding feel like one, the designer and her crew will be adding colourful characters that are present in every wedding.

"I'm endeavouring to act it out on the catwalk. There will be characters like the weird aunty, the out of control kids, the people who drink too much - all these things will play out as part of the catwalk show," she told Fairfax NZ.

So why Australians and not look for her fellow Kiwis? Ms Stretton said that she wants to give Aussies opportunity to have their union legally recognised.

New Zealand has started allowing gay marriage to be legal in the country since April 2013. Unfortunately for its neighbour, Australia still doesn't recognise same-sex unions, which prompts some gay Australians to cross borders to exchange I Do's.

"It's absurd that gay people can't marry in Australia, it really is," the wedding gown designer said.

It will be a win-win situation for both the marrying couple and her brand. The women will be able to marry legally, and her fashion label will be able to attract strong online presence.

She is appealing to the bridal market as well to consider her brand.

"It started in the recession. Brides who may have typically spent $3000-5000 on a wedding dress started looking elsewhere for a better deal. Stretton's custom dresses sell for around $2000."

She added, "At the end of the day, it's about great frocks and weddings never go away, they keep coming around."

The "Come on Oz, say I Do" winners will be styled by the famed designer herself. Their flights and accommodations are included in the prize, but the women must be willing to trust their special day to Ms Stretton.

The competition started receiving entries on July 1 and will stop on July 31. Australian women residents over the age of 18 are allowed to enter, and they must do so by filling out the application form at www.comeonoz.com.