"For the wedding dress it will be Marchesa, we've already established that," she told StyleList before the Luca Luca show at Mercedes-Benz Fashion Week.
But other designers will also figure in her wardrobe for the big day. "I'm sure there will be a few changes so maybe Luca Luca in between," she said.
"We are trying to see which venue will be the best for what we want, probably in England," she said. "It will be about 130 to 150 people, so kind of medium-sized."
Nemcova, who wore Prada shoes with a Luca Luca belted skirt and patterned top, also has to select an outfit for the Academy Awards. "I've never done the Oscar red carpet. I don't know. But if you have very high heels and platforms and very tiny skirts, it can be pretty complicated."
New York Fashion Week will be a busy time for the 31-year-old. "I have a few different shows, Vivienne Tam and Diesel and Tommy Hilfiger and Marchesa."
The model revealed past runway horror stories and her composed response to the crises. "A few times, a shoe which was tied around my legs, would untie while walking, so these kinds of things, that's usual, that's normal, you just have to take it with confidence and don't let it throw you off of your rhythm."
And her personal style secret?
"The rule of less is more, that's what I go with!"