A Walmart spokesman told BuzzFeed News that the category should never have been on the website.
"We first heard about it this morning — our teams immediately engaged, we're working to remove it as soon as possible and make sure it never happens again," Walmart spokesman Ravi Jariwala said.
"This never should have been on our site. It is unacceptable, and we apologize," Jariwala added. "We are working to remove it as soon as possible and ensure this never happens again."
Walmart appears to have taken a new approach to plus-size costuming this year, offering a special section of costumes on their website specifically for "fat girls," as first pointed out this morning by Jezebel.
The link began redirecting from a section that said "fat girl costumes" around 11:30 a.m., and now offers "related products" of plus-size costumes.
It's not quite clear who or what is behind the questionable section name, but the costume offerings are similar to that in the Women's Plus Size Adult section.
Jezebel speculated that it may be a developer's joke that accidentally went live.