Psst: Your yoga pants might be too revealing

A popular maker of yoga gear is pulling its black yoga pants from stores shelves because the sheer material is, um, a bit too revealing.

Lululemon Athletica, a Canadian company, pulled the pants from shelves and its website over the weekend. The company says it is not sure why the pants are so sheer since it hasn't changed materials.

"We have determined that certain shipments of product received from our factories and available in store from March 1, 2013 do not meet our technical specifications," the company said in a statement. "The items affected are certain styles of women's bottoms in our signature black Luon fabric. The ingredients, weight and longevity qualities of the pants remain the same but the coverage does not, resulting in a level of sheerness in some of our women's black Luon bottoms that falls short of our very high standards."

The company says it is working to with the supplier to replace the fabric. It is certainly bad news for Lululemon, given that the pants represent about 17% of all women's bottoms sold in its stores. So, it is warning customers to expect a shortage.

"We regret any inconvenience this has caused for our guests. It is always our first priority to protect the quality of our fabrics that keep our guest so loyal to our products. We will accept nothing less than the very highest quality we are known for," said lululemon CEO Christine Day.

The company is telling customers that bought the pants that they can return them for a full refund.

The situation is bad enough that the company is cutting its first-quarter revenue forecast as a result of the recall. Its shares fell $3.90, or 5.9 percent, to $62 in after-hours trading on Monday. Lululemon anticipates first-quarter revenue between $333 million and $343 million. Its prior guidance was for $350 million to $355 million. Analysts expect $352.1 million.