"We love try-anything Kiwis looking for some fun and a bit of exercise. David lost weight and got fit, while we sat on the couch watching."
Leech said he didn't want the twerking items but might get them framed for posterity.
"But if there is ever a DWTS Hall of Fame, they certainly belong there. David will be remembered long after all the glitz and glam is gone."
He said he had wanted to support Seymour's efforts and Kidsline by bidding for the outfit.
"I think the charity itself is really worthy," he said.
Seymour also offered to throw in some free twerking lessons for the winner and while Leech wasn't keen on that he may take the MP up on the offer to personally deliver it.
The Trade Me listing attracted its share of attention for the tongue-in-cheek description.
"This is where you could benefit by acquiring your very own authentic twerk suit. The suit not only brings back Richard Simmons' 1980s in glorious fluoro colour, it allows the flexibility of movement that a true twerk requires. Sequins, strategically placed on the waistband, ensure your twerking action, far from unnoticed, will be accentuated to perfection," the listing read.
"This twerk suit is truly powerful. It saw off the nation's adorable mother Suzy Cato. New Zealand's biggest and most serious newspaper, the Herald, ran a picture of it for seven days in a row. You are potentially purchasing the most powerful power suit in Aotearoa."