Would you spend $90 on a plain white T-shirt? Probably not. But it's the latest addition to www.goop.com:  a white tee designed by Gwyneth Paltrow -- and people are buying it. 

The T-shirt was designed in collaboration with Kain Label, creators of the perfect tee, and is inspired by tuxedo tailoring. 

Grosgrain piping has been added to the shoulders and sides of the T-shirt, and the length has been shortened to modernize the standard item, but from the front, it really doesn't stand out too much from your average white T-shirt, especially not as much as the price indicates that it should. 

And the T-shirt is only offered in one size that claims to comfortably fit a U.S. size 0 to 8. 

The Goop Collection, featured on Paltrow's lifestyle website, aims to put together all "must have items" in one place. Each week, the Goop launches one limited-edition collaboration item from wardrobes samples to home accessories. 

This week's item is "the Marrakesh jean," a wide-leg, lengthening jean that comes with a price tag of $200. The Goop collaborated with MiH to develop the unwashed pure denim. "Over time and with wear, the color will change naturally to become your own worn-in, faded favorite," states the Goop's description.   

In other celebrity designer news, Mary-Kate and Ashley Olsen launched a black alligator backpack with a $34,000 price tag. 

"Crafted in Italy using traditional techniques and specially sourced materials, the Row's black alligator backpack is a key style from the label's sought-after accessories collection. Transcend the seasons, and carry it year-round with the canvas straps or short-top handle, keeping the rest of your look pared-back to keep the focus on this covetable carryall," the bag is described on the retailer's website.

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