The planned $140,000 service, which should have gone ahead last September, was stalled through lack of funding from the Otago District Health Board.
It will proceed in a limited way next year with private funding.
It is hoped enough money can be raised to employ a Plunket nurse one day a week.
Post-natal depression is estimated to affect about 13% of mothers.
Plunket's Otago-Southland operations manager Barb Long said support for the Zonta Club of Metropolitan Dunedin Extraordinary Fashion Show, which will be held on September 11, had been strong.
About 350 of the 420 available tickets had been sold so far.
Recent publicity of the Otago Community Hospice funding difficulties and of Plunket's situation had made people think about what they could do in their communities to support services.
It was ironic that of two services being "most vocal" about the funding situation, one dealt with the start of the life and the other dealt with its end, she said.
Zonta's fashion committee chairwoman Lyn Farry said the club supported the hospice last year with its fundraising.
It was happy to support the post-natal depression cause this year.
It fitted the organisation's mission to advance the status of women.
The committee realised its contribution would be "only a small drop in the ocean", but it would enable some support for women with post-natal depression.
This is the fashion show's ninth year.
It started at Corstorphine House, moved to the Otago Museum, and has been held at the Town Hall for the past six years.
Among the items for auction this year are a pedal car imported from Germany, art works from Suzy Platt, Clare Beynon, Kim Gotlieb and Tania Stevens, bottles of wine signed by Prime Minister Helen Clark and her deputy Dr Michael Cullen, and whisky signed by National Party leader John Key and his deputy Bill English.
