The Death Wish director will marry for the first time at the age of 75 when he exchanges vows with girlfriend Geraldine Lynton-Edwards at Chelsea Old Town Hall in London.
Winner wants to keep the ceremony a low-key affair and has opted to cut the exchange of vows to just four minutes and have his friend Sir Michael Caine and his wife Shakira as the sole witnesses to the nuptials.
The director will also dress down for the occasion, in a pair of tartan pyjamas.
He tells Britain's The Independent, "It's still on, 1.30pm at the Chelsea Registry Office. I shall be wearing pyjama bottoms. They are handmade pyjama bottoms by Turnbull & Asser and they are very comfortable. They do actually look like nice tartan trousers.
"It's true that not many people get married in pyjama bottoms but then not many wait 50 years to get married. As Michael (Caine) told me, the important thing at our age is to wear whatever feels comfortable.
"There won't be dancing or speeches. We've chosen the shortest possible wedding version. I think we can cut it down to four minutes. Michael (Caine) wants to get home to Surrey. I want it to pass charmingly and sweetly.
"I don't have any nerves. I don't want my life to change in the slightest. I've known her for so many years. I'm a Scorpio and we hate change. I'm a recluse but Geraldine's more adventurous."
But Winner did hold a star-studded pre-wedding luncheon on Sunday (18Sep11) in celebration of the impending nuptials, inviting "the people that really matter in my life - David Frost, Lord Lloyd-Webber, the photographer Terry O'Neill and the singer Chris Rea".