Rousey, 26, made the announcement from her official Twitter page.
"Heres a pic of the actual tshirt get urs here http://www.marcjacobs.com/look/detail/ec6ab325-8524-4073-8f51-7755d83d0f9a/ … #protecttheskinyourein #nyuskincancerinstitute," Rousey tweeted.
Fight fans interested in Rousey's new shirt can check it out by following this link.
Rousey, a star judoka and former Olympic athlete, has done several revealing photo shoots this past year, including ones that appeared in Maxim and ESPN the Magazine's "Body Issue."
However, her new Marc Jacobs shirt takes things to the next level.
The shirt, which was released by critically-acclaimed designer Marc Jacobs, will raise funds to benefit the NYU Skin Cancer Institute.
UFC 168: Rousey vs Tate
Rousey is set to fight perennial title contender, Miesha Tate, for the UFC bantamweight belt on Dec. 28 in Las Vegas, Nev.
Rousey had fun with recent movie roles and photo shoots, but she's excited to get back in the cage.
“The movie stuff was fun, but by the time it was over, I said, ‘Oh, thank God,’” Rousey said. “’I’m so ready to get back in the gym.’ ... It’s tough to have to look good and say some line 19 million times. I’d rather slum it and not shave and punch things.”
Rousey knows her upcoming fight with Tate will help push women's MMA to the next level.
"I want to be able to sit and have that look of contentment and have that smile that I see Royce with when he's at those [UFC] events," Rousey said. "I really want there to be women’s MMA fights in the UFC 20 years from now and be able to sit there and just revel in what was created."