Charlie Sheen had his trademark bowling shirts. Ashton Kutcher appears to be going with an even more casual look for his "Two and a Half Men" stint.

Kutcher -- who'll star as broken-hearted Internet billionaire Walden Schmidt on the revamped "Men" when it premieres on Sept. 19 -- strips down for Ellen DeGeneres on Monday's episode of "The Ellen DeGeneres Show."
Also read: "Two and a Half Men" Cast Goes Nude in New Ad
It's a look he's sported before -- Kutcher, along with his new costars Jon Cryer and Angus T. Jones, flaunted their birthday suits in an ad for the series back in July.
Also read: Ashton Kutcher Confirms Charlie Sheen's "Two and a Half Men" Death
As Kutcher explains to DeGeneres, since the ad has been "getting a lot of attention ... I just figured I'm going to do everything nude from now on."
Shhh -- nobody tell the Parents Television Council, because their heads just might explode.