Old Navy Under Fire for Perceived Sexism, 'Size-ism' The retailer faces criticism for higher-priced, plus-sized women's clothing.

 -- Furious customers are demanding Old Navy implement a new policy when it comes to some of its plus-sized clothing for women, items the retail giant charges more for than regular sizes.

“It’s really pretty frustrating to me,” Renee Posey, the woman behind a Change.org petition that now has more than 33,000 signatures, told ABC News.

She says she found a price markup on some of Old Navy’s plus-sized items for women online, although its men’s line costs the same across the board.

“I thought that it was sexist and that it was sizeist,” Posey of Jamestown, New York, said.

Upon looking at the site, ABC News not only found a separate tab for “Women’s Plus” items, but also found different prices on items. The Rockstar Super Skinny Jeans, for example, normally cost $35 for regular sizes, but cost $45 for plus size.

Old Navy told ABC News in a statement that its “plus-size clothes cost more because we invest more in them,” saying the line is “specifically designed and manufactured to fit and flatter our valued customers.”

The plus-sized items are not available for purchase in stores. They are only sold online, which is another aspect Posey says she’s working with Old Navy to change.

“We have seen instances where companies have not included plus sizes in their lines,” said Hayley Peterson, a retail reporter for Business Insider. “Take Abercrombie, for example, which recently added larger sizes to its clothing offering after a backlash.”

These examples help prove the idea that when customers go to war with their favorite stores, they’ll sometimes win.

Old Navy’s full statement provided to ABC News:

“Old Navy is proud to provide stylish clothing at a great price to all of our customers, including our plus-size customers,” spokeswoman Debbie Felix wrote. “A dedicated team of plus-size designers and merchants create the absolute best products for our plus-sized customers because they focus on the perfect fit. These clothes are specifically designed and manufactured to fit and flatter our valued customers. While we don’t make more money on our plus-size line, our plus-size clothes cost more because we invest more in them."